A027394 - OEIS

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A027394 as a simple table

n	a(n)
0	1
1	7
2	70
3	854
4	12068
5	191996
6	3374392
7	64635640
8	1335753664
9	29548086848
10	695221579136
11	17307703505792
12	453917707384960
13	12494500081323904
14	359807967643449088
15	10809816056831434496
16	337981832271282386432

[1,7,70,854,12068,191996,3374392,64635640, 1335753664,29548086848,695221579136, 17307703505792,453917707384960,12494500081323904, 359807967643449088,10809816056831434496, 337981832271282386432]