A091346 - OEIS

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A091346 as a simple table

n	a(n)
0	0
1	1
2	3
3	19
4	135
5	1171
6	11823
7	136459
8	1771815
9	25561891
10	405658143
11	7022891899
12	131714587095
13	2660335742611
14	57570797744463
15	1328913670495339
16	32592691757283975
17	846383665814211331
18	23200396829832102783

[0,1,3,19,135,1171,11823,136459,1771815,25561891, 405658143,7022891899,131714587095,2660335742611, 57570797744463,1328913670495339,32592691757283975, 846383665814211331,23200396829832102783]