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A263956 as a simple table

na(n)
16
240
3118
4354
51209
64334
714525
846022
9141006
10427611
111270118
123707059
1310650367
1430235396
1584926968
16236340047
17652236286
181787173735
194866827711
2013182285189
2135538045627
2295417738007
23255294004187
24680978483881

[6,40,118,354,1209,4334,14525,46022,141006,427611,
 1270118,3707059,10650367,30235396,84926968,
 236340047,652236286,1787173735,4866827711,
 13182285189,35538045627,95417738007,255294004187,
 680978483881]