A127087 - OEIS

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A127087 as a simple table

n	a(n)
0	1
1	1
2	3
3	11
4	48
5	244
6	1420
7	9318
8	68019
9	545984
10	4772890
11	45079020
12	456958589
13	4943710161
14	56809133108
15	690510011727
16	8845800877774
17	119052630071419
18	1678622651280617
19	24733730857289108
20	379989034049167269

[1,1,3,11,48,244,1420,9318,68019,545984,4772890, 45079020,456958589,4943710161,56809133108, 690510011727,8845800877774,119052630071419, 1678622651280617,24733730857289108, 379989034049167269]