A093858 - OEIS

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A093858 as a simple table

n	a(n)
0	1
1	2
2	3
3	8
4	27
5	116
6	607
7	3758
8	26913
9	219062
10	1998471
11	20203772
12	224239963
13	2711083328
14	35468323227
15	499267608506
16	7524482450817
17	120890986821578
18	2062671258417643
19	37248973638339152
20	709793170386861531

[1,2,3,8,27,116,607,3758,26913,219062,1998471, 20203772,224239963,2711083328,35468323227, 499267608506,7524482450817,120890986821578, 2062671258417643,37248973638339152, 709793170386861531]