A037748 - OEIS

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A037748 as a simple table

n	a(n)
1	2
2	19
3	152
4	1217
5	9738
6	77907
7	623256
8	4986049
9	39888394
10	319107155
11	2552857240
12	20422857921
13	163382863370
14	1307062906963
15	10456503255704
16	83652026045633
17	669216208365066
18	5353729666920531

[2,19,152,1217,9738,77907,623256,4986049,39888394, 319107155,2552857240,20422857921,163382863370, 1307062906963,10456503255704,83652026045633, 669216208365066,5353729666920531]