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A231040 as a simple table

na(n)
10
20
332
41344
517984
6677204
718856728
8564645420
916234948496
10475975504692
1113857021589642
12404691502166966
1311799362329503764
14344308929571301874
1510043260926278906802
16293007140636817319366
178547634832665972057722

[0,0,32,1344,17984,677204,18856728,564645420,
 16234948496,475975504692,13857021589642,
 404691502166966,11799362329503764,
 344308929571301874,10043260926278906802,
 293007140636817319366,8547634832665972057722]