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A061640 as a simple table

n a(n)
0 0
1 1
2 4
3 24
4 240
5 4080
6 110880
7 4404960
8 238452480
9 16777393920
10 1484592883200
11 161180605555200
12 21054378333542400
13 3256459844769331200
14 588451470437627596800
15 122827588904844375552000 

[0,1,4,24,240,4080,110880,4404960,238452480,
 16777393920,1484592883200,161180605555200,
 21054378333542400,3256459844769331200,
 588451470437627596800,122827588904844375552000]

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Last modified June 17 03:50 EDT 2024. Contains 373432 sequences. (Running on oeis4.)