Number of (n+2) X (1+2) 0..1 arrays with each 3 X 3 subblock having clockwise perimeter pattern 00000000 00000001 or 00000101.

A259945

Number of (n+2) X (1+2) 0..1 arrays with each 3 X 3 subblock having clockwise perimeter pattern 00000000 00000001 or 00000101.

Terms

    a(0) =34a(1) =60a(2) =156a(3) =365a(4) =801a(5) =1825a(6) =4272a(7) =9840a(8) =22444a(9) =51509a(10) =118673a(11) =272721a(12) =625828a(13) =1437556a(14) =3303988a(15) =7590621a(16) =17435081a(17) =40053457a(18) =92021928a(19) =211404824a(20) =485651892a(21) =1115697125a(22) =2563141785a(23) =5888362641a(24) =13527406476a(25) =31076799084a(26) =71393512556

External references