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.

A001761 a(n) = (2*n)!/(n+1)!.

Table of values

n a(n)
0 1
1 1
2 4
3 30
4 336
5 5040
6 95040
7 2162160
8 57657600
9 1764322560
10 60949324800
11 2346549004800
12 99638080819200
13 4626053752320000
14 233153109116928000
15 12677700308232960000
16 739781100339240960000
17 46113021921146019840000

List of values

[1, 1, 4, 30, 336, 5040, 95040, 2162160, 57657600, 1764322560, 60949324800, 2346549004800, 99638080819200, 4626053752320000, 233153109116928000, 12677700308232960000, 739781100339240960000, 46113021921146019840000]

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

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