A105996 - OEIS

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A105996 as a simple table

n	a(n)
0	1
1	2
2	4
3	11
4	41
5	222
6	1761
7	21064
8	386241
9	11044282
10	500411824
11	36427700084
12	4313893200131
13	840463941752366
14	272080763704257502
15	147646989859379243894
16	135364497363933610026002

[1,2,4,11,41,222,1761,21064,386241,11044282, 500411824,36427700084,4313893200131, 840463941752366,272080763704257502, 147646989859379243894,135364497363933610026002]