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A231038 as a simple table

na(n)
10
20
30
44
50
632
780
8560
92080
1010720
1146496
12220896
13998432
144634272
1521207840
1697791904
17449099040
182066934176
199501790240
2043707407520
21200983135008
22924361443232
234250915450400
2419549937082016
2589907588137248

[0,0,0,4,0,32,80,560,2080,10720,46496,220896,
 998432,4634272,21207840,97791904,449099040,
 2066934176,9501790240,43707407520,200983135008,
 924361443232,4250915450400,19549937082016,
 89907588137248]