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A177860 as a simple table

n a(n)
1 1
2 1
3 4
4 8
5 540
6 12960
7 1797120
8 22619520
9 465813504
10 267346759680000
11 216218419200000
12 199658024013127680000
13 136256285631578112000000
14 12446179270879850496000000
15 34611344543529418987929600 

[1,1,4,8,540,12960,1797120,22619520,465813504,
 267346759680000,216218419200000,
 199658024013127680000,136256285631578112000000,
 12446179270879850496000000,
 34611344543529418987929600]

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Last modified April 24 20:08 EDT 2024. Contains 371963 sequences. (Running on oeis4.)