a(n) = A069837(n) - (10^n-1)*2/9.

Terms

a(0) =0a(1) =1a(2) =1a(3) =15a(4) =51a(5) =101a(6) =51a(7) =1a(8) =5a(9) =155a(10) =1a(11) =1051a(12) =51a(13) =105a(14) =5a(15) =311a(16) =1335a(17) =355a(18) =105a(19) =31a(20) =55a(21) =51a(22) =105a(23) =1031a(24) =15a(25) =105a(26) =55a(27) =5a(28) =355a(29) =115