a(n) is the number whose base-4 digits are 1 followed by the first n-1 terms of the periodic sequence with initial period 2,0,3.

A378497

a(n) is the number whose base-4 digits are 1 followed by the first n-1 terms of the periodic sequence with initial period 2,0,3.

Terms

    a(0) =1a(1) =6a(2) =24a(3) =99a(4) =398a(5) =1592a(6) =6371a(7) =25486a(8) =101944a(9) =407779a(10) =1631118a(11) =6524472a(12) =26097891a(13) =104391566a(14) =417566264a(15) =1670265059a(16) =6681060238a(17) =26724240952a(18) =106896963811a(19) =427587855246

External references