A155250 - OEIS

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A155250 as a simple table

n	a(n)
3	1
4	7
5	25
6	55
7	126
8	1606
9	18444
10	121046
11	869192
12	17245415
13	494281520
14	10371088568
15	228981497623
16	9186375268339
17	573254602567584
18	35362817621154552

[1,7,25,55,126,1606,18444,121046,869192,17245415, 494281520,10371088568,228981497623,9186375268339, 573254602567584,35362817621154552]