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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.

A055981 a(n) = ceiling(n!/d(n!)).

Table of values

n a(n)
1 1
2 1
3 2
4 3
5 8
6 24
7 84
8 420
9 2268
10 13440
11 73920
12 604800
13 3931200
14 33633600
15 324324000
16 3891888000
17 33081048000
18 435891456000
19 4140968832000
20 59281238016000
21 840311548876800
22 11708340914350080
23 134645920515025920
24 2554547108585472000
25 45616912653312000000

List of values

[1, 1, 2, 3, 8, 24, 84, 420, 2268, 13440, 73920, 604800, 3931200, 33633600, 324324000, 3891888000, 33081048000, 435891456000, 4140968832000, 59281238016000, 840311548876800, 11708340914350080, 134645920515025920, 2554547108585472000, 45616912653312000000]

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

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