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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.

A380023 a(n) = a(n-1) * a(n-2) * (1 - 2 / (n * (n-1))), with a(1) = 2, a(2) = 3.

Table of values

n a(n)
1 2
2 3
3 4
4 10
5 36
6 336
7 11520
8 3732480
9 41803776000
10 152564385447936000
11 6261807987664209366220800000
12 940854207318376503485146088437972992000000000
13 5815917000990435607656487842294594291938222391518950745702400000000000000

List of values

[2, 3, 4, 10, 36, 336, 11520, 3732480, 41803776000, 152564385447936000, 6261807987664209366220800000, 940854207318376503485146088437972992000000000, 5815917000990435607656487842294594291938222391518950745702400000000000000]

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

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