Number of (n+1) X (n+1) 0..2 arrays with every 2 X 3 or 3 X 2 subblock having exactly one clockwise edge increases.

A207042

Number of (n+1) X (n+1) 0..2 arrays with every 2 X 3 or 3 X 2 subblock having exactly one clockwise edge increases.

Terms

    a(0) =81a(1) =270a(2) =750a(3) =2244a(4) =4944a(5) =11712a(6) =35904a(7) =79104a(8) =187392a(9) =574464a(10) =1265664a(11) =2998272a(12) =9191424a(13) =20250624a(14) =47972352a(15) =147062784a(16) =324009984a(17) =767557632a(18) =2353004544a(19) =5184159744a(20) =12280922112a(21) =37648072704a(22) =82946555904a(23) =196494753792

External references