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.

A337593 a(0) = 1; a(n) = (1/n) * Sum_{k=1..n} binomial(n,k)^2 * k * 3^(k-1) * a(n-k).

Table of values

n a(n)
0 1
1 1
2 5
3 42
4 573
5 11226
6 294804
7 9946791
8 417064365
9 21187915362
10 1278636342660
11 90195692894451
12 7338668846348844
13 681052861293535251
14 71405270562056271741
15 8388541745045127600597
16 1096298129481068449931085
17 158383969954582566159384786
18 25153555538082783169267336764

List of values

[1, 1, 5, 42, 573, 11226, 294804, 9946791, 417064365, 21187915362, 1278636342660, 90195692894451, 7338668846348844, 681052861293535251, 71405270562056271741, 8388541745045127600597, 1096298129481068449931085, 158383969954582566159384786, 25153555538082783169267336764]