Number of nX4 0..1 arrays with each 1 adjacent to 3 or 4 king-move neighboring 1s.

A296111

Number of nX4 0..1 arrays with each 1 adjacent to 3 or 4 king-move neighboring 1s.

Terms

    a(0) =1a(1) =4a(2) =9a(3) =16a(4) =64a(5) =185a(6) =528a(7) =2109a(8) =7336a(9) =25548a(10) =96284a(11) =350352a(12) =1275030a(13) =4720164a(14) =17327263a(15) =63606177a(16) =234363052a(17) =861828278a(18) =3169215181a(19) =11663750978a(20) =42906823150a(21) =157839351044a(22) =580741120133

External references