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.

A370021 Expansion of g.f. A(x) satisfying Sum_{n=-oo..+oo} (-1)^n * (x^n + A(x))^n = 1 + 3*Sum_{n>=1} (-1)^n * x^(n^2).

Table of values

n a(n)
1 1
2 1
3 4
4 9
5 22
6 63
7 155
8 415
9 1124
10 2957
11 8047
12 21817
13 59048
14 161870
15 442675
16 1214563
17 3348145
18 9228858
19 25514319
20 70682731
21 195993889
22 544578231
23 1515027660
24 4219560585
25 11768353857
26 32853953466
27 91812137378
28 256831830373
29 719046731299
30 2014808160498
31 5650037329385

List of values

[1, 1, 4, 9, 22, 63, 155, 415, 1124, 2957, 8047, 21817, 59048, 161870, 442675, 1214563, 3348145, 9228858, 25514319, 70682731, 195993889, 544578231, 1515027660, 4219560585, 11768353857, 32853953466, 91812137378, 256831830373, 719046731299, 2014808160498, 5650037329385]