A037556 - OEIS

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A037556 as a simple table

n	a(n)
1	2
2	15
3	106
4	744
5	5209
6	36464
7	255250
8	1786751
9	12507258
10	87550808
11	612855657
12	4289989600
13	30029927202
14	210209490415
15	1471466432906
16	10300265030344
17	72101855212409
18	504712986486864
19	3532990905408050

[2,15,106,744,5209,36464,255250,1786751,12507258, 87550808,612855657,4289989600,30029927202, 210209490415,1471466432906,10300265030344, 72101855212409,504712986486864,3532990905408050]