Number of (n+2) X (1+2) 0..1 arrays with each 3 X 3 subblock having clockwise perimeter pattern 00010101 00101011 or 01010101.

A260920

Number of (n+2) X (1+2) 0..1 arrays with each 3 X 3 subblock having clockwise perimeter pattern 00010101 00101011 or 01010101.

Terms

    a(0) =36a(1) =48a(2) =104a(3) =186a(4) =297a(5) =491a(6) =883a(7) =1489a(8) =2534a(9) =4289a(10) =7421a(11) =12581a(12) =21537a(13) =36634a(14) =62796a(15) =106888a(16) =182812a(17) =311578a(18) =532706a(19) =908294a(20) =1551949a(21) =2647450a(22) =4522307a(23) =7716224a(24) =13177700a(25) =22488756a(26) =38401007a(27) =65541083a(28) =111905468a(29) =191009570

External references