A236578 - OEIS

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A236578 as a simple table

n	a(n)
0	1
1	9
2	155
3	2861
4	52817
5	972557
6	17892281
7	329097125
8	6052932495
9	111328274273
10	2047599783121
11	37660384283749
12	692666924307063
13	12739845501187821
14	234317040993180833
15	4309665744385061493
16	79265335342431559977

[1,9,155,2861,52817,972557,17892281,329097125, 6052932495,111328274273,2047599783121, 37660384283749,692666924307063,12739845501187821, 234317040993180833,4309665744385061493, 79265335342431559977]