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A279580 as a simple table

na(n)
10
20
30
42
54
60
74
836
940
100
1114
12304
13944
14352
150
1640
172212
1820776
1923072
203008
210
22120
2315428
24406200
251356120
26547168
2725280
280
29352
30103648
317630156
3272177144
3386246944
3412701248
35209792
360
371032
38680052
39138602548
403684310576
4112490527012

[0,0,0,2,4,0,4,36,40,0,14,304,944,352,0,40,2212,
 20776,23072,3008,0,120,15428,406200,1356120,
 547168,25280,0,352,103648,7630156,72177144,
 86246944,12701248,209792,0,1032,680052,138602548,
 3684310576,12490527012]