A059731 - OEIS

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A059731 as a simple table

n	a(n)
0	1
1	2
2	4
3	8
4	20
5	94
6	2108
7	695476
8	120914640072
9	102916053328656342226
10	2647928508186688136206570909837012470132
11	1011512706265078711983169811701795624935502997612381468564241675434874528

[1,2,4,8,20,94,2108,695476,120914640072, 102916053328656342226, 2647928508186688136206570909837012470132, 10115127062650787119831698117017956249355029976123\ 81468564241675434874528]