A228136 - OEIS

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A228136 as a simple table

n	a(n)
1	1
2	2
3	4
4	10
5	16
6	30
7	103
8	210
9	261
10	1625
11	3081
12	6693
13	32697
14	155165
15	262546
16	697924
17	760750
18	1081782
19	5547049
20	14637837
21	18044997

[1,2,4,10,16,30,103,210,261,1625,3081,6693,32697, 155165,262546,697924,760750,1081782,5547049, 14637837,18044997]