Number of numbers whose base-4/3 expansion (see A024631) has n digits.

Terms

a(0) =4a(1) =4a(2) =4a(3) =4a(4) =8a(5) =8a(6) =12a(7) =16a(8) =20a(9) =28a(10) =36a(11) =48a(12) =64a(13) =88a(14) =116a(15) =156a(16) =208a(17) =276a(18) =368a(19) =492a(20) =656a(21) =872a(22) =1164a(23) =1552a(24) =2068a(25) =2760a(26) =3680a(27) =4904a(28) =6540a(29) =8720