A177406 - OEIS

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A177406 as a simple table

n	a(n)
1	1
2	3
3	18
4	135
5	1134
6	10206
7	96228
8	938304
9	9384660
10	95746860
11	992583072
12	10425704562
13	110714749236
14	1186711306875
15	12821975547696
16	139501306797120
17	1527013735182810
18	16805125811826495
19	185831030179447380

[1,3,18,135,1134,10206,96228,938304,9384660, 95746860,992583072,10425704562,110714749236, 1186711306875,12821975547696,139501306797120, 1527013735182810,16805125811826495, 185831030179447380]