A179486 - OEIS

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A179486 as a simple table

n	a(n)
1	1
2	1
3	3
4	12
5	56
6	285
7	1533
8	8571
9	49311
10	290019
11	1735845
12	10538550
13	64741482
14	401708636
15	2513837931
16	15847467276
17	100547976684
18	641571037002
19	4114313992851
20	26503239829953
21	171416342026944
22	1112726829455289

[1,1,3,12,56,285,1533,8571,49311,290019,1735845, 10538550,64741482,401708636,2513837931, 15847467276,100547976684,641571037002, 4114313992851,26503239829953,171416342026944, 1112726829455289]