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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.

A094941 a(n) is n! times the coefficient of Pi^floor(n/2) in the volume of an n-dimensional unit ball.

Table of values

n a(n)
0 1
1 2
2 2
3 8
4 12
5 64
6 120
7 768
8 1680
9 12288
10 30240
11 245760
12 665280
13 5898240
14 17297280
15 165150720
16 518918400
17 5284823040
18 17643225600
19 190253629440
20 670442572800
21 7610145177600
22 28158588057600
23 334846387814400
24 1295295050649600

List of values

[1, 2, 2, 8, 12, 64, 120, 768, 1680, 12288, 30240, 245760, 665280, 5898240, 17297280, 165150720, 518918400, 5284823040, 17643225600, 190253629440, 670442572800, 7610145177600, 28158588057600, 334846387814400, 1295295050649600]

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

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