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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.

A203800 a(n) = (1/n) * Sum_{d|n} moebius(n/d) * Lucas(d)^(d-1), where Lucas(n) = A000032(n).

Table of values

n a(n)
1 1
2 1
3 5
4 85
5 2928
6 314925
7 84974760
8 63327890015
9 123670531939440
10 644385861467631972
11 8853970669063185618000
12 321538767413685546538468385
13 30768712746239178236068160093280
14 7755868453482819803691622493685140880
15 5144106193113274410507722020733942141881664

List of values

[1, 1, 5, 85, 2928, 314925, 84974760, 63327890015, 123670531939440, 644385861467631972, 8853970669063185618000, 321538767413685546538468385, 30768712746239178236068160093280, 7755868453482819803691622493685140880, 5144106193113274410507722020733942141881664]

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

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