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A087648 as a simple table

na(n)
01
13
29
331
4120
5514
62407
712205
866491
9386699
102388096
1115589732
12107165081
13773106715
145836100685
1545981026703
16377230766908
173215977070706
1828437411817135
19260380616093533
202464930698184351
2124091925888687459
22242802079705721156
232520198597834860148

[1,3,9,31,120,514,2407,12205,66491,386699,2388096,
 15589732,107165081,773106715,5836100685,
 45981026703,377230766908,3215977070706,
 28437411817135,260380616093533,2464930698184351,
 24091925888687459,242802079705721156,
 2520198597834860148]