A015511 - OEIS

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A015511 as a simple table

n	a(n)
1	1
2	1
3	11
4	1012
5	830852
6	6133349464
7	407444538242984
8	243599680968409330048
9	1310771150941736627904810368
10	63477451180042308935531134194562816
11	27666523379269090447091129488519658150671616

[1,1,11,1012,830852,6133349464,407444538242984, 243599680968409330048, 1310771150941736627904810368, 63477451180042308935531134194562816, 27666523379269090447091129488519658150671616]