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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.

A135860 a(n) = binomial(n*(n+1), n).

Table of values

n a(n)
0 1
1 2
2 15
3 220
4 4845
5 142506
6 5245786
7 231917400
8 11969016345
9 706252528630
10 46897636623981
11 3461014728350400
12 281014969393251275
13 24894763097057357700
14 2389461906843449885700
15 247012484980695576597296
16 27361230617617949782033713
17 3233032526324680287912449550

List of values

[1, 2, 15, 220, 4845, 142506, 5245786, 231917400, 11969016345, 706252528630, 46897636623981, 3461014728350400, 281014969393251275, 24894763097057357700, 2389461906843449885700, 247012484980695576597296, 27361230617617949782033713, 3233032526324680287912449550]

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

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