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.

A156985 Triangle formed by coefficients of the expansion of p(x,n) = (1-x)^(2*n + 1)*Sum_{j >= 0} (1 +j +j^2)^n * x^j.

Table of values

n a(n)
0 1
1 1
2 0
3 1
4 1
5 4
6 14
7 4
8 1
9 1
10 20
11 175
12 328
13 175
14 20
15 1
16 1
17 72
18 1708
19 9784
20 17190
21 9784
22 1708
23 72
24 1
25 1
26 232
27 14189
28 199616
29 884498
30 1431728
31 884498
32 199616
33 14189
34 232
35 1
36 1
37 716
38 108250
39 3353948
40 31986447
41 115907544
42 176287788
43 115907544
44 31986447
45 3353948
46 108250
47 716
48 1

List of values

[1, 1, 0, 1, 1, 4, 14, 4, 1, 1, 20, 175, 328, 175, 20, 1, 1, 72, 1708, 9784, 17190, 9784, 1708, 72, 1, 1, 232, 14189, 199616, 884498, 1431728, 884498, 199616, 14189, 232, 1, 1, 716, 108250, 3353948, 31986447, 115907544, 176287788, 115907544, 31986447, 3353948, 108250, 716, 1]