A241074 - OEIS

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A241074 as a simple table

n	a(n)
1	2
2	12
3	67
4	386
5	2333
6	14438
7	90729
8	576616
9	3692697
10	23768052
11	153496623
12	993485284
13	6439467991
14	41777922610
15	271212402395
16	1761347749066
17	11441763716997
18	74338495106470
19	483038660675361
20	3138923546597920

[2,12,67,386,2333,14438,90729,576616,3692697, 23768052,153496623,993485284,6439467991, 41777922610,271212402395,1761347749066, 11441763716997,74338495106470,483038660675361, 3138923546597920]