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.

A337592 a(0) = 1; a(n) = (1/n) * Sum_{k=1..n} binomial(n,k)^2 * k * 2^(k-1) * a(n-k).

Table of values

n a(n)
0 1
1 1
2 4
3 28
4 312
5 4936
6 104128
7 2806336
8 93560064
9 3765265408
10 179415074304
11 9964625629696
12 636737424291840
13 46303081167540224
14 3796275000959266816
15 348100339275620651008
16 35448445862069986361344
17 3984266642444252234153984
18 491556877841462376382332928

List of values

[1, 1, 4, 28, 312, 4936, 104128, 2806336, 93560064, 3765265408, 179415074304, 9964625629696, 636737424291840, 46303081167540224, 3796275000959266816, 348100339275620651008, 35448445862069986361344, 3984266642444252234153984, 491556877841462376382332928]