A099015 - OEIS

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A099015 as a simple table

n	a(n)
0	1
1	2
2	8
3	33
4	140
5	592
6	2509
7	10626
8	45016
9	190685
10	807764
11	3421728
12	14494697
13	61400482
14	260096680
15	1101787113
16	4667245276
17	19770767984
18	83750317589
19	354772037730
20	1502838469496
21	6366125914117
22	26967342128548

[1,2,8,33,140,592,2509,10626,45016,190685,807764, 3421728,14494697,61400482,260096680,1101787113, 4667245276,19770767984,83750317589,354772037730, 1502838469496,6366125914117,26967342128548]