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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.

A360602 a(n) = ((2*n + 1)! / n!)^2 / (n + 1).

Table of values

n a(n)
0 1
1 18
2 1200
3 176400
4 45722880
5 18441561600
6 10685567692800
7 8414884558080000
8 8646761377013760000
9 11237331085567082496000
10 18020592759036666839040000
11 34953943088278121445457920000
12 80662945588334126412595200000000
13 218412210097326433146332774400000000

List of values

[1, 18, 1200, 176400, 45722880, 18441561600, 10685567692800, 8414884558080000, 8646761377013760000, 11237331085567082496000, 18020592759036666839040000, 34953943088278121445457920000, 80662945588334126412595200000000, 218412210097326433146332774400000000]

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

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