A131927 - OEIS

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A131927 as a simple table

n	a(n)
0	0
1	1
2	8
3	136
4	2888
5	68680
6	1749896
7	46707976
8	1289214152
9	36496595656
10	1053849164552
11	30918300671368
12	919029058099784
13	27617782977715528
14	837674888992142984
15	25610757376777402888
16	788450850824647610312

[0,1,8,136,2888,68680,1749896,46707976,1289214152, 36496595656,1053849164552,30918300671368, 919029058099784,27617782977715528, 837674888992142984,25610757376777402888, 788450850824647610312]