A121160 - OEIS

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A121160 as a simple table

n	a(n)
5	1
6	1
7	6
8	12
9	43
10	106
11	322
12	864
13	2483
14	6829
15	19226
16	53293
17	148866
18	413501
19	1151506
20	3200184
21	8901478
22	24742852
23	68800520
24	191275736
25	531888416

[1,1,6,12,43,106,322,864,2483,6829,19226,53293, 148866,413501,1151506,3200184,8901478,24742852, 68800520,191275736,531888416]