Number of (n+2) X (2+2) 0..1 arrays with each 3 X 3 subblock having clockwise perimeter pattern 00010101 00100101 or 01010101.

A261259

Number of (n+2) X (2+2) 0..1 arrays with each 3 X 3 subblock having clockwise perimeter pattern 00010101 00100101 or 01010101.

Terms

    a(0) =41a(1) =52a(2) =110a(3) =232a(4) =418a(5) =758a(6) =1436a(7) =2724a(8) =5122a(9) =9588a(10) =17988a(11) =33828a(12) =63574a(13) =119382a(14) =224202a(15) =421154a(16) =791148a(17) =1486082a(18) =2791356a(19) =5243210a(20) =9848830a(21) =18499920a(22) =34749860a(23) =65273442a(24) =122608532a(25) =230305832a(26) =432602416a(27) =812592642a(28) =1526359722a(29) =2867087450

External references