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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.

A386880 a(n) = [x^n] 1/(1 - x)^(n*(n+1)/2).

Table of values

n a(n)
0 1
1 1
2 6
3 56
4 715
5 11628
6 230230
7 5379616
8 145008513
9 4431613550
10 151473214816
11 5727160371180
12 237377895350076
13 10704005376506540
14 521748877569771510
15 27338999059076777600
16 1532576541123942256285
17 91527291781199227579626
18 5801648509628587739612170
19 389032765009190361630625600

List of values

[1, 1, 6, 56, 715, 11628, 230230, 5379616, 145008513, 4431613550, 151473214816, 5727160371180, 237377895350076, 10704005376506540, 521748877569771510, 27338999059076777600, 1532576541123942256285, 91527291781199227579626, 5801648509628587739612170, 389032765009190361630625600]

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

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