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A266097 as a simple table

na(n)
15
236
3161
4929
54893
626948
7145274
8790986
94286644
1023281595
11126318252
12685685972
133721248548
1420197452145
15109618496442
16594950280201
173229037349370
1817525382955525
1995117628995827
20516243924279843

[5,36,161,929,4893,26948,145274,790986,4286644,
 23281595,126318252,685685972,3721248548,
 20197452145,109618496442,594950280201,
 3229037349370,17525382955525,95117628995827,
 516243924279843]