A209718 - OEIS

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A209718 as a simple table

n	a(n)
1	2
2	13
3	115
4	1468
5	19993
6	242036
7	2830612
8	33559479
9	405001256
10	4768478349
11	55177233176
12	632269120829
13	7270703713269
14	83723657505339
15	959510778223080
16	10972846708863116
17	125671067783934260
18	1441312273531923562

[2,13,115,1468,19993,242036,2830612,33559479, 405001256,4768478349,55177233176,632269120829, 7270703713269,83723657505339,959510778223080, 10972846708863116,125671067783934260, 1441312273531923562]