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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.

A261779 a(n) = ceiling((n-1)! / n).

Table of values

n a(n)
1 1
2 1
3 1
4 2
5 5
6 20
7 103
8 630
9 4480
10 36288
11 329891
12 3326400
13 36846277
14 444787200
15 5811886080
16 81729648000
17 1230752346353
18 19760412672000
19 336967037143579
20 6082255020441600
21 115852476579840000
22 2322315553259520000
23 48869596859895986087
24 1077167364120207360000
25 24817936069329577574400
26 596585001666576384000000

List of values

[1, 1, 1, 2, 5, 20, 103, 630, 4480, 36288, 329891, 3326400, 36846277, 444787200, 5811886080, 81729648000, 1230752346353, 19760412672000, 336967037143579, 6082255020441600, 115852476579840000, 2322315553259520000, 48869596859895986087, 1077167364120207360000, 24817936069329577574400, 596585001666576384000000]

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

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