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.

A218686 O.g.f.: Sum_{n>=0} n^n * (1+n^2*x)^n * x^n/n! * exp(-n*(1+n^2*x)*x).

Table of values

n a(n)
0 1
1 1
2 2
3 15
4 107
5 1164
6 13932
7 207527
8 3424441
9 65365273
10 1366815507
11 31899555046
12 806153628997
13 22260455705106
14 659196741236329
15 21028295211402871
16 713819243969142111
17 25836118882427921161
18 988875977638287049631
19 40043648314495526922945

List of values

[1, 1, 2, 15, 107, 1164, 13932, 207527, 3424441, 65365273, 1366815507, 31899555046, 806153628997, 22260455705106, 659196741236329, 21028295211402871, 713819243969142111, 25836118882427921161, 988875977638287049631, 40043648314495526922945]