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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.

A203854 a(n) = (1/n) * Sum_{d|n} moebius(n/d) * Lucas(d)^3, where Lucas(n) = A000204(n).

Table of values

n a(n)
1 1
2 13
3 21
4 79
5 266
6 957
7 3484
8 12935
9 48768
10 185951
11 716418
12 2781675
13 10878520
14 42789478
15 169181010
16 671866245
17 2678678730
18 10716651456
19 43007270292
20 173072549610
21 698235680844
22 2823329210391
23 11439823946306
24 46440709210035
25 188856966693230
26 769241291729020

List of values

[1, 13, 21, 79, 266, 957, 3484, 12935, 48768, 185951, 716418, 2781675, 10878520, 42789478, 169181010, 671866245, 2678678730, 10716651456, 43007270292, 173072549610, 698235680844, 2823329210391, 11439823946306, 46440709210035, 188856966693230, 769241291729020]

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

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