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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.

A386879 a(n) = [x^n] 1/(1 - x)^(n*(n-1)/2).

Table of values

n a(n)
0 1
1 0
2 1
3 10
4 126
5 2002
6 38760
7 888030
8 23535820
9 708930508
10 23930713170
11 895068996640
12 36749279048405
13 1643385429346680
14 79515468511191440
15 4139207762053520646
16 230672804560960311000
17 13703037308872895467960
18 864424422377992704918690
19 57711135174726478041405270
20 4065392394346039279040037520

List of values

[1, 0, 1, 10, 126, 2002, 38760, 888030, 23535820, 708930508, 23930713170, 895068996640, 36749279048405, 1643385429346680, 79515468511191440, 4139207762053520646, 230672804560960311000, 13703037308872895467960, 864424422377992704918690, 57711135174726478041405270, 4065392394346039279040037520]

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

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