A135081 - OEIS

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A135081 as a simple table

n	a(n)
0	1
1	1
2	2
3	8
4	50
5	436
6	4912
7	68098
8	1122952
9	21488640
10	468331252
11	11456367820
12	310888085872
13	9269621420284
14	301268634277760
15	10601062978739338
16	401550210033474420
17	16291237867482727084
18	704847239600911931248

[1,1,2,8,50,436,4912,68098,1122952,21488640, 468331252,11456367820,310888085872,9269621420284, 301268634277760,10601062978739338, 401550210033474420,16291237867482727084, 704847239600911931248]