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A004308 as a simple table

na(n)
40
50
624
7154
81664
915984
10173000
112004486
1225086336
13337215372
144852472744
1574473953570
161214929163904
1721000334935308
18383498204201496
197379028867234934
20149233618755354240
213165087929247599208
2270251457394397108280

[0,0,24,154,1664,15984,173000,2004486,25086336,
 337215372,4852472744,74473953570,1214929163904,
 21000334935308,383498204201496,7379028867234934,
 149233618755354240,3165087929247599208,
 70251457394397108280]