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A090694 as a simple table

n a(n)
1 1
2 0
3 3
4 3
5 20
6 120
7 210
8 3640
9 5264
10 211680
11 609840
12 11517660
13 68262480
14 1000359360
15 14082868800
16 89182613520
17 2391049140480
18 13726429516800
19 503669982816000
20 2561900746204800
21 134281295242698240
22 983641429745694720

[1,0,3,3,20,120,210,3640,5264,211680,609840,
 11517660,68262480,1000359360,14082868800,
 89182613520,2391049140480,13726429516800,
 503669982816000,2561900746204800,
 134281295242698240,983641429745694720]

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Last modified September 4 15:57 EDT 2024. Contains 375685 sequences. (Running on oeis4.)