I think it's time we move on to a new puzzle. Here are the last three values of the puzzle:
2, 12, 10111
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1C, 3, 1, 13, 16, 14, 22, 13, 4, 2, 12, 10111 (base 13 to base 2)
25, 3, 1, 13, 15, 12, 16, 9, 4, 2, 5, 23 (base 10 values)
Y, C, A, M, O, L, P, I, D, B, E, W (corresponding alphabetical value from base 10)
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As others pointed out above 1C should have indicated a change in base but there was no indication that it was base-16. However, a change in base was definitely in play. It is base 13, and each subsequent value is a descending base, so 3 was actually 3 in base 12 and the last value, 10111, is in base 2. Nine values were given and three were missing for a total of 12, the length of the word "Webdiplomacy." I think the trick was to figure out that if there was a finite sequence then it has to be constrained by something else and not just the numerical values (in this case, the letters of Webdiplomacy). So using the decimal values and transforming them into letters would have reveal a straightforward interpretation and hence the missing letters leading to the corresponding decimal values.
Anyhow, I hope this was a fun puzzle. I have another one in mind but I haven't worked out in the details yet.
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Tom Petty and the Heartbreakers are touring.
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