Number of (n+2) X (1+2) 0..1 arrays with each 3 X 3 subblock having clockwise perimeter pattern 00000001 or 00000011.

A259716

Number of (n+2) X (1+2) 0..1 arrays with each 3 X 3 subblock having clockwise perimeter pattern 00000001 or 00000011.

Terms

    a(0) =32a(1) =54a(2) =140a(3) =242a(4) =312a(5) =722a(6) =1388a(7) =1974a(8) =3824a(9) =7718a(10) =12060a(11) =21218a(12) =42344a(13) =71394a(14) =121052a(15) =233030a(16) =412608a(17) =698390a(18) =1295276a(19) =2349522a(20) =4031384a(21) =7276274a(22) =13283916a(23) =23174102a(24) =41199248a(25) =74964486a(26) =132548156a(27) =234319298a(28) =423455688a(29) =755086082

External references