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A090765 as a simple table

n a(n)
0 1
1 1
2 1
3 6
4 12
5 24
6 40
7 1008
8 3360
9 362880
10 181440
11 39916800
12 15966720
13 6227020800
14 32947200
15 261534873600
16 373621248000
17 2845499424768
18 88921857024000
19 121645100408832000
20 1422749712384000
21 3005349539512320000
22 10218188434341888000
23 25852016738884976640000

[1,1,1,6,12,24,40,1008,3360,362880,181440,
 39916800,15966720,6227020800,32947200,
 261534873600,373621248000,2845499424768,
 88921857024000,121645100408832000,
 1422749712384000,3005349539512320000,
 10218188434341888000,25852016738884976640000]

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Last modified April 19 12:14 EDT 2024. Contains 371792 sequences. (Running on oeis4.)