A168412 - OEIS

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A168412 as a simple table

n	a(n)
0	0
1	1
2	1040
3	88695
4	2097664
5	24415625
6	181402416
7	988671775
8	4294983680
9	15690559329
10	50000050000
11	142655915831
12	371504309760
13	896080382665
14	2024782853744
15	4324878309375
16	8796093546496
17	17135948863745

[0,1,1040,88695,2097664,24415625,181402416, 988671775,4294983680,15690559329,50000050000, 142655915831,371504309760,896080382665, 2024782853744,4324878309375,8796093546496, 17135948863745]