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A070768 as a simple table

na(n)
10
20
30
40
50
64
737
8381
92717
1018760
11116439
12565943
133033697
1414835067
1572633658
16356923880
171746833634
188532601529
1941868336466
20205618704167
211012359995953

[0,0,0,0,0,4,37,381,2717,18760,116439,565943,
 3033697,14835067,72633658,356923880,1746833634,
 8532601529,41868336466,205618704167,1012359995953]