Number of (n+2) X 3 binary arrays avoiding patterns 000 and 111 in rows, columns and nw-to-se diagonals.

A202640

Number of (n+2) X 3 binary arrays avoiding patterns 000 and 111 in rows, columns and nw-to-se diagonals.

Terms

    a(0) =66a(1) =172a(2) =462a(3) =1278a(4) =3448a(5) =9394a(6) =25526a(7) =69336a(8) =188418a(9) =511960a(10) =1391014a(11) =3779620a(12) =10269688a(13) =27904004a(14) =75818836a(15) =206009414a(16) =559753846a(17) =1520922896a(18) =4132541760a(19) =11228644088a(20) =30509661310a(21) =82898648850a(22) =225246223922a(23) =612022778622

External references