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.

A359673 a(n) = coefficient of x^n in A(x) where 1 = Sum_{n=-oo..+oo} (2*x + (-x)^n*A(x)^n)^n.

Table of values

n a(n)
0 1
1 2
2 5
3 13
4 30
5 74
6 202
7 616
8 2126
9 7828
10 29366
11 110398
12 414214
13 1556848
14 5892713
15 22524354
16 86954484
17 338421674
18 1324660464
19 5204326208
20 20498580511
21 80907096678
22 320002290542
23 1268500509496
24 5040195484362
25 20073242195580
26 80120884387322
27 320442284717582
28 1283939790460139

List of values

[1, 2, 5, 13, 30, 74, 202, 616, 2126, 7828, 29366, 110398, 414214, 1556848, 5892713, 22524354, 86954484, 338421674, 1324660464, 5204326208, 20498580511, 80907096678, 320002290542, 1268500509496, 5040195484362, 20073242195580, 80120884387322, 320442284717582, 1283939790460139]