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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.

A322943 a(n) = n! [x^n] -exp(-1/(3*(x - 1)^3) - 1/3)/(x - 1).

Table of values

n a(n)
0 1
1 2
2 9
3 60
4 513
5 5286
6 63417
7 865824
8 13229505
9 223336458
10 4123226601
11 82559530692
12 1780580892609
13 41125146159150
14 1012187976013593
15 26434618529133096
16 729843662368002177
17 21233024209964157714
18 649022529915336217545
19 20789723945673232443468
20 696253958136289126229121

List of values

[1, 2, 9, 60, 513, 5286, 63417, 865824, 13229505, 223336458, 4123226601, 82559530692, 1780580892609, 41125146159150, 1012187976013593, 26434618529133096, 729843662368002177, 21233024209964157714, 649022529915336217545, 20789723945673232443468, 696253958136289126229121]

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

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