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

A259766

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

Terms

    a(0) =49a(1) =87a(2) =167a(3) =299a(4) =564a(5) =1086a(6) =2045a(7) =3870a(8) =7371a(9) =14001a(10) =26647a(11) =50766a(12) =96574a(13) =183815a(14) =350088a(15) =666497a(16) =1268925a(17) =2416285a(18) =4600654a(19) =8759750a(20) =16679685a(21) =31759384a(22) =60472021a(23) =115144725a(24) =219245665a(25) =417461876a(26) =794885812a(27) =1513533557a(28) =2881900030

External references