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

A261258

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

Terms

    a(0) =36a(1) =41a(2) =91a(3) =166a(4) =321a(5) =586a(6) =1123a(7) =2082a(8) =3938a(9) =7358a(10) =13863a(11) =25971a(12) =48833a(13) =91602a(14) =172099a(15) =323001a(16) =606629a(17) =1138805a(18) =2138465a(19) =4014874a(20) =7538696a(21) =14154181a(22) =26576436a(23) =49899170a(24) =93691463a(25) =175913869a(26) =330296900a(27) =620163290a(28) =1164419552a(29) =2186309750

External references