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A281979 as a simple table

na(n)
10
251
31287808
41711273635
5452970333696
643211657266860
72038311950075136
857420813107839395
91091144797392901120
1015199162675148592018
11164678453263146595200
121449942615368630353516
1310725152052216567264768
1468394401763888606334680

[0,51,1287808,1711273635,452970333696,
 43211657266860,2038311950075136,57420813107839395,
 1091144797392901120,15199162675148592018,
 164678453263146595200,1449942615368630353516,
 10725152052216567264768,68394401763888606334680]