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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.

A304582 Denominator of Sum_{k=1..n-1} 1/(k*(n-k))^2.

Table of values

n a(n)
0 1
1 1
2 1
3 2
4 144
5 72
6 64800
7 1800
8 2822400
9 3175200
10 317520000
11 635040
12 11064936960
13 15367968
14 2545242860160
15 14609174580000
16 8310997094400
17 259718659200
18 24319016372851200
19 75058692508800
20 10838475198270720000
21 2389883781218693760
22 374701571140216320

List of values

[1, 1, 1, 2, 144, 72, 64800, 1800, 2822400, 3175200, 317520000, 635040, 11064936960, 15367968, 2545242860160, 14609174580000, 8310997094400, 259718659200, 24319016372851200, 75058692508800, 10838475198270720000, 2389883781218693760, 374701571140216320]

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

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