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.

A337153 a(n) = 3^n * (n!)^2 * Sum_{k=0..n} 1 / ((-3)^k * (k!)^2).

Table of values

n a(n)
0 1
1 2
2 25
3 674
4 32353
5 2426474
6 262059193
7 38522701370
8 7396358663041
9 1797315155118962
10 539194546535688601
11 195727620392454962162
12 84554332009540543653985
13 42869046328837055632570394
14 25206999241356188711951391673
15 17014724487915427380567189379274
16 13067308406719048228275601443282433

List of values

[1, 2, 25, 674, 32353, 2426474, 262059193, 38522701370, 7396358663041, 1797315155118962, 539194546535688601, 195727620392454962162, 84554332009540543653985, 42869046328837055632570394, 25206999241356188711951391673, 17014724487915427380567189379274, 13067308406719048228275601443282433]