Number of (n+2)X(2+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000011 or 00010101.

A260835

Number of (n+2)X(2+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000011 or 00010101.

Terms

    a(0) =82a(1) =131a(2) =288a(3) =496a(4) =796a(5) =1645a(6) =2976a(7) =4890a(8) =9332a(9) =17659a(10) =30090a(11) =54846a(12) =104380a(13) =184549a(14) =329454a(15) =618800a(16) =1121728a(17) =1998197a(18) =3692344a(19) =6772932a(20) =12142202a(21) =22172787a(22) =40769872a(23) =73664484a(24) =133728146a(25) =245325455a(26) =445857864a(27) =808254626a(28) =1477620470

External references