Number of (n+2) X (2+2) 0..1 arrays with each 3 X 3 subblock having clockwise perimeter pattern 00000001 or 00000011.

A259717

Number of (n+2) X (2+2) 0..1 arrays with each 3 X 3 subblock having clockwise perimeter pattern 00000001 or 00000011.

Terms

    a(0) =54a(1) =95a(2) =228a(3) =392a(4) =556a(5) =1219a(6) =2330a(7) =3544a(8) =6772a(9) =13549a(10) =22196a(11) =39298a(12) =77918a(13) =136015a(14) =234216a(15) =449446a(16) =817220a(17) =1411079a(18) =2618246a(19) =4847534a(20) =8502364a(21) =15413237a(22) =28586848a(23) =50995616a(24) =91420870a(25) =168451387a(26) =304255892a(27) =544300220a(28) =994495588a(29) =1808110199

External references