A087751 - OEIS

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A087751 as a simple table

n	a(n)
0	0
1	1
2	7
3	56
4	538
5	6124
6	81048
7	1226112
8	20902992
9	396857376
10	8308373760
11	190212376320
12	4728556327680
13	126865966625280
14	3654264347274240
15	112484501485977600
16	3685202487258163200
17	128039255560187596800

[0,1,7,56,538,6124,81048,1226112,20902992, 396857376,8308373760,190212376320,4728556327680, 126865966625280,3654264347274240, 112484501485977600,3685202487258163200, 128039255560187596800]