A065846 - OEIS

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A065846 as a simple table

n	a(n)
1	1
2	2
3	4
4	7
5	26
6	87
7	226
8	800
9	2424
10	9975
11	40045
12	152852
13	626232
14	2317403
15	9962949
16	43599477
17	179247754
18	777881238

[1,2,4,7,26,87,226,800,2424,9975,40045,152852, 626232,2317403,9962949,43599477,179247754, 777881238]