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A263763 as a simple table

na(n)
10
20
31
44
531
6146
71289
87736
968811
10354568
112562282
1212614090
1380560052
14406847624
152530379183
1613576171696
1785562497735
18476311791218
192983359368303
2016861046247216
21104017882519889
22591843352618090
233599197579892399

[0,0,1,4,31,146,1289,7736,68811,354568,2562282,
 12614090,80560052,406847624,2530379183,
 13576171696,85562497735,476311791218,
 2983359368303,16861046247216,104017882519889,
 591843352618090,3599197579892399]