Number of (n+2) X (1+2) 0..1 arrays with each 3 X 3 subblock having clockwise perimeter pattern 00000001 00000101 or 00000111.

A261704

Number of (n+2) X (1+2) 0..1 arrays with each 3 X 3 subblock having clockwise perimeter pattern 00000001 00000101 or 00000111.

Terms

    a(0) =48a(1) =76a(2) =172a(3) =338a(4) =628a(5) =1298a(6) =2752a(7) =5526a(8) =10972a(9) =22462a(10) =46160a(11) =93354a(12) =188556a(13) =384154a(14) =782784a(15) =1587790a(16) =3221196a(17) =6550678a(18) =13318688a(19) =27044962a(20) =54927964a(21) =111631314a(22) =226840208a(23) =460792838a(24) =936118684a(25) =1902095342a(26) =3864635632a(27) =7851378074

External references