A155260 - OEIS

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A155260 as a simple table

n	a(n)
3	1
4	7
5	25
6	55
7	130
8	1405
9	16466
10	116148
11	894657
12	15191483
13	400416491
14	9046002744
15	215811308360
16	8089887873673
17	451390921829837

[1,7,25,55,130,1405,16466,116148,894657,15191483, 400416491,9046002744,215811308360,8089887873673, 451390921829837]