A377756 - OEIS

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A377756 as a simple table

n	a(n)
1	1
2	1
3	3
4	6
5	18
6	55
7	169
8	477
9	1245
10	2750
11	5380
12	8989
13	12674
14	14741
15	13928
16	10297
17	6185
18	2910
19	1012
20	289
21	69
22	12
23	2

[1,1,3,6,18,55,169,477,1245,2750,5380,8989,12674, 14741,13928,10297,6185,2910,1012,289,69,12,2]