A091852 - OEIS

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A091852 as a simple table

n	a(n)
1	2
2	19
3	208
4	3023
5	52004
6	1079263
7	24845332
8	663589691
9	21809669044
10	769910292199
11	31595368408378
12	1432693760237483
13	67842962092519574
14	3469898586979325623
15	198354535000733806154
16	12566530264688830748431

[2,19,208,3023,52004,1079263,24845332,663589691, 21809669044,769910292199,31595368408378, 1432693760237483,67842962092519574, 3469898586979325623,198354535000733806154, 12566530264688830748431]