Number of (n+2)X(4+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00010101 00101011 or 01010101.

A260923

Number of (n+2)X(4+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00010101 00101011 or 01010101.

Terms

    a(0) =186a(1) =279a(2) =896a(3) =2208a(4) =4522a(5) =10617a(6) =25690a(7) =58606a(8) =134296a(9) =314471a(10) =729920a(11) =1686078a(12) =3909750a(13) =9081515a(14) =21033032a(15) =48765365a(16) =113054330a(17) =262238504a(18) =607643220a(19) =1409411303a(20) =3266491942a(21) =7576260468a(22) =17557722330a(23) =40724481666a(24) =94379231110

External references