A037635 - OEIS

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A037635 as a simple table

n	a(n)
1	2
2	15
3	108
4	758
5	5307
6	37152
7	260066
8	1820463
9	12743244
10	89202710
11	624418971
12	4370932800
13	30596529602
14	214175707215
15	1499229950508
16	10494609653558
17	73462267574907
18	514235873024352
19	3599651111170466

[2,15,108,758,5307,37152,260066,1820463,12743244, 89202710,624418971,4370932800,30596529602, 214175707215,1499229950508,10494609653558, 73462267574907,514235873024352,3599651111170466]