Number of (n+2)X(2+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000101 or 00010101.

A260100

Number of (n+2)X(2+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000101 or 00010101.

Terms

    a(0) =85a(1) =201a(2) =477a(3) =1151a(4) =2794a(5) =6804a(6) =16453a(7) =39854a(8) =96501a(9) =233975a(10) =566755a(11) =1373344a(12) =3326942a(13) =8061337a(14) =19530608a(15) =47321405a(16) =114650673a(17) =277784695a(18) =673027156a(19) =1630654912a(20) =3950831441a(21) =9572304480a(22) =23192285181a(23) =56191572297a(24) =136144001797

External references