Number of binary vectors (x_1,...x_n) satisfying Sum_{i=1..n} i*x_i = 3 (mod n+1) = size of Varshamov-Tenengolts code VT_3(n).

A054200

Number of binary vectors (x_1,...x_n) satisfying Sum_{i=1..n} i*x_i = 3 (mod n+1) = size of Varshamov-Tenengolts code VT_3(n).

Terms

    a(0) =1a(1) =1a(2) =2a(3) =2a(4) =3a(5) =6a(6) =9a(7) =16a(8) =29a(9) =51a(10) =93a(11) =172a(12) =315a(13) =585a(14) =1094a(15) =2048a(16) =3855a(17) =7285a(18) =13797a(19) =26214a(20) =49938a(21) =95325a(22) =182361a(23) =349536a(24) =671088a(25) =1290555a(26) =2485532a(27) =4793490a(28) =9256395a(29) =17895730

External references