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.

A136205 Square array read by antidiagonals: T(m,n) = H(n,2*m)*(2*m)!/(2*m+2*n-1). H(0,m) = 1/m, for all positive integers m. H(n,m) = Sum_{k=1..m} H(n-1,k).

Table of values

n a(n)
0 1
1 1
2 2
3 1
4 10
5 24
6 1
7 22
8 252
9 720
10 1
11 38
12 892
13 12176
14 40320
15 1
16 58
17 2232
18 60336
19 966240
20 3628800
21 1
22 82
23 4632
24 199440
25 6202080
26 114341760
27 479001600
28 1
29 110
30 8524
31 526256
32 25598016
33 905049216
34 18897709824
35 87178291200
36 1
37 142
38 14412
39 1197360

List of values

[1, 1, 2, 1, 10, 24, 1, 22, 252, 720, 1, 38, 892, 12176, 40320, 1, 58, 2232, 60336, 966240, 3628800, 1, 82, 4632, 199440, 6202080, 114341760, 479001600, 1, 110, 8524, 526256, 25598016, 905049216, 18897709824, 87178291200, 1, 142, 14412, 1197360]