cp's OEIS Frontend

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.

A110371 a(n)=[(n+1)(n+2)(n+3)...(2n)]/(1+2+3+...+n).

Table of values

n a(n)
1 2
2 4
3 20
4 168
5 2016
6 31680
7 617760
8 14414400
9 392071680
10 12189864960
11 426645273600
12 16606346803200
13 711700577280000
14 33307587016704000
15 1690360041097728000
16 92472637542405120000
17 5425061402487767040000
18 339780161524233830400000
19 22629358757513973104640000

List of values

[2, 4, 20, 168, 2016, 31680, 617760, 14414400, 392071680, 12189864960, 426645273600, 16606346803200, 711700577280000, 33307587016704000, 1690360041097728000, 92472637542405120000, 5425061402487767040000, 339780161524233830400000, 22629358757513973104640000]

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

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