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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A317824 a(n) = A000422(n)^^A000422(n) (mod 10^len(A000422(n))), where ^^ indicates tetration or hyper-4 (e.g., 3^^4 = 3^(3^(3^3))).

Table of values

n a(n)
1 1
2 21
3 721
4 8721
5 8721
6 708721
7 5708721
8 65708721
9 165708721
10 65165708721
11 1165165708721
12 861165165708721
13 5861165165708721
14 5005861165165708721
15 55005861165165708721
16 48055005861165165708721
17 8448055005861165165708721
18 388448055005861165165708721
19 49388448055005861165165708721

List of values

[1, 21, 721, 8721, 8721, 708721, 5708721, 65708721, 165708721, 65165708721, 1165165708721, 861165165708721, 5861165165708721, 5005861165165708721, 55005861165165708721, 48055005861165165708721, 8448055005861165165708721, 388448055005861165165708721, 49388448055005861165165708721]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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