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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.

A107868 Column 0 of triangle A107867; a(n) = C( n*(n-1)/2 + n + 1, n).

Table of values

n a(n)
0 1
1 2
2 6
3 35
4 330
5 4368
6 74613
7 1560780
8 38608020
9 1101716330
10 35607051480
11 1285063345176
12 51209646652255
13 2232785266876080
14 105710363656182600
15 5399936810873056584
16 295998326072989842600
17 17328840976366636057110

List of values

[1, 2, 6, 35, 330, 4368, 74613, 1560780, 38608020, 1101716330, 35607051480, 1285063345176, 51209646652255, 2232785266876080, 105710363656182600, 5399936810873056584, 295998326072989842600, 17328840976366636057110]

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

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