a(n) = sum of all numbers whose binary expansion is n bits long, starts and ends with a 1 bit, and contains no 00 bit pairs.

A373629

a(n) = sum of all numbers whose binary expansion is n bits long, starts and ends with a 1 bit, and contains no 00 bit pairs.

Terms

    a(0) =1a(1) =3a(2) =12a(3) =39a(4) =131a(5) =426a(6) =1389a(7) =4503a(8) =14596a(9) =47259a(10) =152991a(11) =495162a(12) =1602521a(13) =5186067a(14) =16782828a(15) =54310911a(16) =175754731a(17) =568755690a(18) =1840534485a(19) =5956098495a(20) =19274345876a(21) =62373103443a(22) =201843619047a(23) =653179698234

External references