A152052 - OEIS

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A152052 as a simple table

n	a(n)
1	2
2	9
3	41
4	203
5	1216
6	8144
7	58622
8	440258
9	3424680
10	27409999
11	224373161
12	1870585459
13	15834656003
14	135779962760
15	1177207270204

[2,9,41,203,1216,8144,58622,440258,3424680, 27409999,224373161,1870585459,15834656003, 135779962760,1177207270204]