A077460 - OEIS

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A077460 as a simple table

n	a(n)
0	1
1	1
2	1
3	3
4	12
5	70
6	464
7	3482
8	27779
9	233556
10	2038484
11	18357672
12	169599492
13	1601270562
14	15401735750
15	150547249932
16	1492451793728
17	14980801247673
18	152047178479946
19	1558569469867824
20	16119428039548246

[1,1,1,3,12,70,464,3482,27779,233556,2038484, 18357672,169599492,1601270562,15401735750, 150547249932,1492451793728,14980801247673, 152047178479946,1558569469867824, 16119428039548246]