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

A259736

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

Terms

    a(0) =22a(1) =36a(2) =74a(3) =136a(4) =230a(5) =414a(6) =760a(7) =1356a(8) =2414a(9) =4348a(10) =7820a(11) =14004a(12) =25114a(13) =45102a(14) =80930a(15) =145162a(16) =260480a(17) =467442a(18) =838696a(19) =1504818a(20) =2700182a(21) =4845016a(22) =8693348a(23) =15598530a(24) =27988744a(25) =50220456a(26) =90110864a(27) =161686882a(28) =290116538a(29) =520558722

External references