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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.

A371768 a(n) = n! * [x^n] (log(2*x - 1) - log(x - 1) - log(x + 1)) / (x - 1). Row sums of A371685.

Table of values

n a(n)
0 0
1 2
2 6
3 34
4 220
5 1868
6 18648
7 222696
8 3061728
9 48199392
10 852857280
11 16813212480
12 365177928960
13 8671294183680
14 223409173317120
15 6207795845798400
16 185021865565286400
17 5887763630809804800
18 199220359130518118400
19 7141874528908565913600
20 270391380094261923840000

List of values

[0, 2, 6, 34, 220, 1868, 18648, 222696, 3061728, 48199392, 852857280, 16813212480, 365177928960, 8671294183680, 223409173317120, 6207795845798400, 185021865565286400, 5887763630809804800, 199220359130518118400, 7141874528908565913600, 270391380094261923840000]

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

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