Number of n X 2 0..1 arrays avoiding the patterns 0 1 0 or 1 0 1 in any row, column, diagonal or antidiagonal.

A206981

Number of n X 2 0..1 arrays avoiding the patterns 0 1 0 or 1 0 1 in any row, column, diagonal or antidiagonal.

Terms

    a(0) =4a(1) =16a(2) =36a(3) =100a(4) =256a(5) =676a(6) =1764a(7) =4624a(8) =12100a(9) =31684a(10) =82944a(11) =217156a(12) =568516a(13) =1488400a(14) =3896676a(15) =10201636a(16) =26708224a(17) =69923044a(18) =183060900a(19) =479259664a(20) =1254718084a(21) =3284894596a(22) =8599965696a(23) =22515002500a(24) =58945041796a(25) =154320122896a(26) =404015326884

External references