Number of (n+2)X4 binary arrays avoiding patterns 000 and 111 in rows, columns and nw-to-se diagonals.

A202641

Number of (n+2)X4 binary arrays avoiding patterns 000 and 111 in rows, columns and nw-to-se diagonals.

Terms

    a(0) =172a(1) =530a(2) =1766a(3) =5948a(4) =19880a(5) =66924a(6) =224940a(7) =755816a(8) =2541276a(9) =8543094a(10) =28716716a(11) =96540806a(12) =324538890a(13) =1090985388a(14) =3667580154a(15) =12329245406a(16) =41447005012a(17) =139332080292a(18) =468390834050

External references