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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.

A161213 a(n) = Sum_{d|n} Moebius(n/d)*d^(b-1)/phi(n) for b = 18.

Table of values

n a(n)
1 1
2 131071
3 64570081
4 8589869056
5 190734863281
6 8463265086751
7 38771752331201
8 562945658454016
9 2779530261754401
10 24999809265103951
11 50544702849929377
12 554648540725313536
13 720867993281778161
14 5081852349802846271
15 12315765571578095761
16 36893206672442392576

List of values

[1, 131071, 64570081, 8589869056, 190734863281, 8463265086751, 38771752331201, 562945658454016, 2779530261754401, 24999809265103951, 50544702849929377, 554648540725313536, 720867993281778161, 5081852349802846271, 12315765571578095761, 36893206672442392576]

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

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