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.

A187056 G.f.: A(x,y,z) = Sum_{n>=0} ((2n)!/n!^2)*[Sum_{k=0..2n} T(n,k)*z^k]*x^(2n)*y^n/(1-x-xy)^(4n+1) where A(x,y,x+xy) = Sum_{n>=0, k=0..n} C(n,k)^4*x^n*y^k at z = x+xy; this is the triangle of coefficients T(n,k), read by rows.

Table of values

n a(n)
0 1
1 7
2 4
3 1
4 131
5 176
6 96
7 16
8 1
9 3067
10 6588
11 5895
12 2416
13 477
14 36
15 1
16 79459
17 235456
18 298816
19 197824
20 73120
21 14656
22 1504
23 64
24 1
25 2181257
26 8252300
27 13668975
28 12563200
29 6966400
30 2373504
31 490700
32 58400
33 3675
34 100
35 1
36 62165039
37 286326288
38 587324232
39 692965040
40 516541455
41 252283968
42 81432456
43 17138304
44 2276145
45 179440
46 7632
47 144
48 1

List of values

[1, 7, 4, 1, 131, 176, 96, 16, 1, 3067, 6588, 5895, 2416, 477, 36, 1, 79459, 235456, 298816, 197824, 73120, 14656, 1504, 64, 1, 2181257, 8252300, 13668975, 12563200, 6966400, 2373504, 490700, 58400, 3675, 100, 1, 62165039, 286326288, 587324232, 692965040, 516541455, 252283968, 81432456, 17138304, 2276145, 179440, 7632, 144, 1]