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A280896 as a simple table

na(n)
10
21
39
4124
51464
615768
7159920
81554304
914632704
10134378112
111209699584
1210713166848
1393585811456
14808068888576
156907767091200
1658538748477440
17492296387559424
184112143740076032
1934141836642680832
20281936660687224832

[0,1,9,124,1464,15768,159920,1554304,14632704,
 134378112,1209699584,10713166848,93585811456,
 808068888576,6907767091200,58538748477440,
 492296387559424,4112143740076032,
 34141836642680832,281936660687224832]