A128085 - OEIS

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A128085 as a simple table

n	a(n)
0	1
1	1
2	2
3	8
4	46
5	340
6	3210
7	36336
8	484636
9	7394458
10	127707302
11	2454109404
12	52091631896
13	1207854671388
14	30431260261770
15	826657521349952
16	24114046688034516
17	751085176539860458
18	24899882719111953556

[1,1,2,8,46,340,3210,36336,484636,7394458, 127707302,2454109404,52091631896,1207854671388, 30431260261770,826657521349952,24114046688034516, 751085176539860458,24899882719111953556]