A145074 - OEIS

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A145074 as a simple table

n	a(n)
0	1
1	3
2	12
3	97
4	885
5	10386
6	141295
7	2218987
8	39171564
9	770029605
10	16652860169
11	393052609026
12	10051000032099
13	276818387211471
14	8168772682637220
15	257133140827399753

[1,3,12,97,885,10386,141295,2218987,39171564, 770029605,16652860169,393052609026,10051000032099, 276818387211471,8168772682637220, 257133140827399753]