A111552 - OEIS

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A111552 as a simple table

n	a(n)
0	1
1	2
2	8
3	46
4	338
5	2930
6	28726
7	311342
8	3679778
9	47000002
10	644538614
11	9443216366
12	147222001954
13	2434125748082
14	42555399987686
15	784634319490894
16	15221022251713538
17	309977607819594818
18	6613678784212854646

[1,2,8,46,338,2930,28726,311342,3679778,47000002, 644538614,9443216366,147222001954,2434125748082, 42555399987686,784634319490894,15221022251713538, 309977607819594818,6613678784212854646]