A261266 - OEIS

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A261266 as a simple table

n	a(n)
0	1
1	2
2	8
3	44
4	264
5	1632
6	10256
7	65200
8	418144
9	2700224
10	17534208
11	114380928
12	748988928
13	4920379648
14	32413343488
15	214038123264
16	1416349369856
17	9389756730368
18	62352450867200
19	414660440811520
20	2761261291024384

[1,2,8,44,264,1632,10256,65200,418144,2700224, 17534208,114380928,748988928,4920379648, 32413343488,214038123264,1416349369856, 9389756730368,62352450867200,414660440811520, 2761261291024384]