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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.

A180119 a(n) = (n+2)! * Sum_{k = 1..n} 1/((k+1)*(k+2)).

Table of values

n a(n)
0 0
1 1
2 6
3 36
4 240
5 1800
6 15120
7 141120
8 1451520
9 16329600
10 199584000
11 2634508800
12 37362124800
13 566658892800
14 9153720576000
15 156920924160000
16 2845499424768000
17 54420176498688000
18 1094805903679488000
19 23112569077678080000
20 510909421717094400000
21 11802007641664880640000

List of values

[0, 1, 6, 36, 240, 1800, 15120, 141120, 1451520, 16329600, 199584000, 2634508800, 37362124800, 566658892800, 9153720576000, 156920924160000, 2845499424768000, 54420176498688000, 1094805903679488000, 23112569077678080000, 510909421717094400000, 11802007641664880640000]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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