A049152 - OEIS

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A049152 as a simple table

n	a(n)
0	1
1	1
2	3
3	11
4	43
5	183
6	815
7	3751
8	17713
9	85317
10	417539
11	2070355
12	10378707
13	52513683
14	267833407
15	1375511991
16	7107227481
17	36920353577
18	192710512163
19	1010189811763
20	5315874933075
21	28071323867887
22	148706825853775

[1,1,3,11,43,183,815,3751,17713,85317,417539, 2070355,10378707,52513683,267833407,1375511991, 7107227481,36920353577,192710512163,1010189811763, 5315874933075,28071323867887,148706825853775]