Number of terms of A072873 less than or equal to 10^n.

Terms

a(0) =2a(1) =5a(2) =9a(3) =15a(4) =25a(5) =36a(6) =52a(7) =73a(8) =98a(9) =129a(10) =167a(11) =213a(12) =270a(13) =338a(14) =421a(15) =517a(16) =632a(17) =768a(18) =920a(19) =1102a(20) =1311a(21) =1547a(22) =1824a(23) =2143a(24) =2501a(25) =2911a(26) =3379a(27) =3906a(28) =4493a(29) =5164