Number of (n+2) X (2+2) 0..1 arrays with each 3 X 3 subblock having clockwise perimeter pattern 00000001 00000011 or 00001111.

A260364

Number of (n+2) X (2+2) 0..1 arrays with each 3 X 3 subblock having clockwise perimeter pattern 00000001 00000011 or 00001111.

Terms

    a(0) =78a(1) =127a(2) =342a(3) =700a(4) =896a(5) =2047a(6) =4438a(7) =6674a(8) =12878a(9) =27877a(10) =46806a(11) =84404a(12) =175894a(13) =316729a(14) =562556a(15) =1122802a(16) =2100112a(17) =3759241a(18) =7255522a(19) =13784466a(20) =25036860a(21) =47321615a(22) =90142076a(23) =165956528a(24) =310385576a(25) =589328265a(26) =1095576864a(27) =2041368188a(28) =3857505346

External references