A136508 - OEIS

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A136508 as a simple table

n	a(n)
0	1
1	1
2	3
3	7
4	23
5	81
6	361
7	1923
8	13113
9	114433
10	1315783
11	20286135
12	420198791
13	12003852369
14	464295025509
15	25153926114307
16	1847231277588405
17	191568316434991857
18	26902669460380225411
19	5357197471644242149975

[1,1,3,7,23,81,361,1923,13113,114433,1315783, 20286135,420198791,12003852369,464295025509, 25153926114307,1847231277588405, 191568316434991857,26902669460380225411, 5357197471644242149975]