A136726 - OEIS

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A136726 as a simple table

n	a(n)
0	1
1	1
2	2
3	5
4	17
5	73
6	407
7	2907
8	26773
9	317954
10	4886310
11	97485657
12	2534891399
13	86295825506
14	3863685633735
15	228686666560004
16	17979843031304262
17	1888025173840826426
18	266025611085446537560
19	50572458313046091569640

[1,1,2,5,17,73,407,2907,26773,317954,4886310, 97485657,2534891399,86295825506,3863685633735, 228686666560004,17979843031304262, 1888025173840826426,266025611085446537560, 50572458313046091569640]