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.

A336271 a(0) = 1; a(n) = Sum_{k=1..n} (-1)^(k+1) * binomial(n,k)^2 * binomial(2*k,k) * a(n-k).

Table of values

n a(n)
0 1
1 2
2 10
3 92
4 1354
5 29252
6 873964
7 34555880
8 1748176714
9 110183215988
10 8467704986260
11 779536758060920
12 84699429189141100
13 10725613123706081720
14 1565870044943751242440
15 261092436660169105108592
16 49312362996510562406915914
17 10473104312824253527997052500

List of values

[1, 2, 10, 92, 1354, 29252, 873964, 34555880, 1748176714, 110183215988, 8467704986260, 779536758060920, 84699429189141100, 10725613123706081720, 1565870044943751242440, 261092436660169105108592, 49312362996510562406915914, 10473104312824253527997052500]