A281691 - OEIS

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A281691 as a simple table

n	a(n)
1	1
2	272
3	14575
4	402470
5	8944910
6	173467508
7	3105145787
8	52667675560
9	858903297578
10	13596253940088
11	210237550445094
12	3189789818725966
13	47643526224223527
14	702294154680069306
15	10236443706663641968

[1,272,14575,402470,8944910,173467508,3105145787, 52667675560,858903297578,13596253940088, 210237550445094,3189789818725966, 47643526224223527,702294154680069306, 10236443706663641968]