A178499 - OEIS

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A178499 as a simple table

n	a(n)
1	0
2	0
3	0
4	170
5	13384
6	257318
7	2774728
8	20202298
9	110018552
10	481719518
11	1781124856
12	5756568738
13	16676946372
14	44127887910
15	108192675468
16	248568720338
17	539925974784
18	1116836380926
19	2212958151968
20	4220919779218

[0,0,0,170,13384,257318,2774728,20202298, 110018552,481719518,1781124856,5756568738, 16676946372,44127887910,108192675468,248568720338, 539925974784,1116836380926,2212958151968, 4220919779218]