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A001813 as a simple table

n a(n)
0 1
1 2
2 12
3 120
4 1680
5 30240
6 665280
7 17297280
8 518918400
9 17643225600
10 670442572800
11 28158588057600
12 1295295050649600
13 64764752532480000
14 3497296636753920000
15 202843204931727360000
16 12576278705767096320000
17 830034394580628357120000
18 58102407620643984998400000

[1,2,12,120,1680,30240,665280,17297280,518918400,
 17643225600,670442572800,28158588057600,
 1295295050649600,64764752532480000,
 3497296636753920000,202843204931727360000,
 12576278705767096320000,830034394580628357120000,
 58102407620643984998400000]

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Last modified March 29 00:26 EDT 2024. Contains 371264 sequences. (Running on oeis4.)