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.

A249475 E.g.f.: exp(2)*P(x) - Q(x), where P(x) = 1/Product_{n>=1} (1 - x^n/n) and Q(x) = Sum_{n>=1} 2^n/Product_{k=1..n} (k - x^k).

Table of values

n a(n)
0 1
1 1
2 5
3 25
4 156
5 1048
6 8400
7 72384
8 710184
9 7519240
10 87797880
11 1098513880
12 14945280640
13 216079283040
14 3352657547680
15 55071779464352
16 961293645943680
17 17669716422651776
18 342988501737128576
19 6978772157389361280
20 149123855108936024576
21 3328674238745847019520

List of values

[1, 1, 5, 25, 156, 1048, 8400, 72384, 710184, 7519240, 87797880, 1098513880, 14945280640, 216079283040, 3352657547680, 55071779464352, 961293645943680, 17669716422651776, 342988501737128576, 6978772157389361280, 149123855108936024576, 3328674238745847019520]