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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.

A203855 a(n) = (1/n) * Sum_{d|n} moebius(n/d) * Lucas(d)^4, where Lucas(n) = A000204(n).

Table of values

n a(n)
1 1
2 40
3 85
4 580
5 2928
6 17440
7 101040
8 609660
9 3706880
10 22887192
11 142567200
12 895855380
13 5667708960
14 36072949560
15 230763023408
16 1482822818820
17 9565561745040
18 61920953016320
19 402074969960400
20 2618069854211784
21 17090016552803440
22 111812320834030800

List of values

[1, 40, 85, 580, 2928, 17440, 101040, 609660, 3706880, 22887192, 142567200, 895855380, 5667708960, 36072949560, 230763023408, 1482822818820, 9565561745040, 61920953016320, 402074969960400, 2618069854211784, 17090016552803440, 111812320834030800]

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

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