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.

A264152 a(n) = (2^floor(n+n/2)/sqrt(Pi)^mod(n+1,2))*Gamma(n+1/2)/Gamma(n/2+1).

Table of values

n a(n)
0 1
1 2
2 6
3 40
4 210
5 2016
6 13860
7 164736
8 1351350
9 18670080
10 174594420
11 2708858880
12 28109701620
13 479259648000
14 5421156741000
15 100069414502400
16 1218404977539750
17 24087296714342400
18 312723944235202500
19 6566957735804928000
20 90252130306279441500
21 2000107698962300928000

List of values

[1, 2, 6, 40, 210, 2016, 13860, 164736, 1351350, 18670080, 174594420, 2708858880, 28109701620, 479259648000, 5421156741000, 100069414502400, 1218404977539750, 24087296714342400, 312723944235202500, 6566957735804928000, 90252130306279441500, 2000107698962300928000]