A037637 - OEIS

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A037637 as a simple table

n	a(n)
1	2
2	19
3	174
4	1568
5	14113
6	127020
7	1143182
8	10288639
9	92597754
10	833379788
11	7500418093
12	67503762840
13	607533865562
14	5467804790059
15	49210243110534
16	442892187994808
17	3986029691953273

[2,19,174,1568,14113,127020,1143182,10288639, 92597754,833379788,7500418093,67503762840, 607533865562,5467804790059,49210243110534, 442892187994808,3986029691953273]