A135868 - OEIS

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A135868 as a simple table

n	a(n)
0	1
1	2
2	9
3	80
4	1368
5	45344
6	2952208
7	381005824
8	97928967168
9	50238812700672
10	51495089926791168
11	105513593089512439808
12	432289346894817079853056
13	3541746937174189008054386688
14	58031524865557213409213540204544

[1,2,9,80,1368,45344,2952208,381005824, 97928967168,50238812700672,51495089926791168, 105513593089512439808,432289346894817079853056, 3541746937174189008054386688, 58031524865557213409213540204544]