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.

A386505 a(0) = 1; a(n) = a(n-1) + Sum_{k=0..n-1} (1 + k) * k^2 * binomial(n-1,k) * a(k) * a(n-1-k).

Table of values

n a(n)
0 1
1 1
2 3
3 43
4 1717
5 146261
6 22851301
7 5923208845
8 2370243182889
9 1386889039102537
10 1137386506152214441
11 1263728857603292729441
12 1850186029852575829090909
13 3487711314718246830637945549
14 8300937715895750334611432889933
15 24529666348754849148034163067487381

List of values

[1, 1, 3, 43, 1717, 146261, 22851301, 5923208845, 2370243182889, 1386889039102537, 1137386506152214441, 1263728857603292729441, 1850186029852575829090909, 3487711314718246830637945549, 8300937715895750334611432889933, 24529666348754849148034163067487381]