A180426 - OEIS

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A180426 as a simple table

n	a(n)
1	3
2	30
3	265
4	2351
5	21062
6	191630
7	1766955
8	16465551
9	154749588
10	1464326721
11	13932672360
12	133165432342
13	1277568139729
14	12295904124627
15	118665023703067
16	1147922359531155

[3,30,265,2351,21062,191630,1766955,16465551, 154749588,1464326721,13932672360,133165432342, 1277568139729,12295904124627,118665023703067, 1147922359531155]