A178703 - OEIS

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A178703 as a simple table

n	a(n)
0	0
1	0
2	1
3	5
4	17
5	52
6	156
7	468
8	1405
9	4217
10	12653
11	37960
12	113880
13	341640
14	1024921
15	3074765
16	9224297
17	27672892
18	83018676
19	249056028
20	747168085
21	2241504257
22	6724512773
23	20173538320
24	60520614960
25	181561844880

[0,0,1,5,17,52,156,468,1405,4217,12653,37960, 113880,341640,1024921,3074765,9224297,27672892, 83018676,249056028,747168085,2241504257, 6724512773,20173538320,60520614960,181561844880]