A037634 - OEIS

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A037634 as a simple table

n	a(n)
1	2
2	13
3	81
4	488
5	2929
6	17577
7	105464
8	632785
9	3796713
10	22780280
11	136681681
12	820090089
13	4920540536
14	29523243217
15	177139459305
16	1062836755832
17	6377020534993
18	38262123209961
19	229572739259768
20	1377436435558609

[2,13,81,488,2929,17577,105464,632785,3796713, 22780280,136681681,820090089,4920540536, 29523243217,177139459305,1062836755832, 6377020534993,38262123209961,229572739259768, 1377436435558609]