A170948 - OEIS

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A170948 as a simple table

n	a(n)
1	0
2	0
3	0
4	11
5	226
6	3597
7	55006
8	892791
9	15763270
10	305360481
11	6483720916
12	150200835113
13	3774756521566
14	102339496556342
15	2977913930684928
16	92579209306356230
17	3062597993515937128
18	107418845568842941190

[0,0,0,11,226,3597,55006,892791,15763270, 305360481,6483720916,150200835113,3774756521566, 102339496556342,2977913930684928, 92579209306356230,3062597993515937128, 107418845568842941190]