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.

A110505 Numerators of unsigned columns of triangle A110504: a(n) = n!*A110504(n,0) = (-1)^k*n!*A110504(n+k,k) for all k >= 0.

Table of values

n a(n)
0 0
1 1
2 3
3 7
4 30
5 144
6 876
7 6084
8 48816
9 438624
10 4389120
11 48263040
12 579242880
13 7529552640
14 105417365760
15 1581231456000
16 25299906508800
17 430096581734400
18 7741753102540800
19 147093162635059200
20 2941864569520128000

List of values

[0, 1, 3, 7, 30, 144, 876, 6084, 48816, 438624, 4389120, 48263040, 579242880, 7529552640, 105417365760, 1581231456000, 25299906508800, 430096581734400, 7741753102540800, 147093162635059200, 2941864569520128000]