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A337505 as a simple table

na(n)
01
12
224
3440
410780
5329112
612006456
7508903824
824559486380
91328964785720
1079670488601704
115240336913228144
12375167786246499064
1329038998659140223600
142416268289647552828400
15215068032231876851531040
1620389611819955706893052460
172051184695261785540782403320

[1,2,24,440,10780,329112,12006456,508903824,
 24559486380,1328964785720,79670488601704,
 5240336913228144,375167786246499064,
 29038998659140223600,2416268289647552828400,
 215068032231876851531040,
 20389611819955706893052460,
 2051184695261785540782403320]