Number of 4Xn 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 2 or 4 neighboring 1s.

A297736

Number of 4Xn 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 2 or 4 neighboring 1s.

Terms

    a(0) =1a(1) =4a(2) =39a(3) =93a(4) =362a(5) =1103a(6) =4795a(7) =15646a(8) =61063a(9) =210279a(10) =808250a(11) =2870341a(12) =10812385a(13) =39046072a(14) =145855473a(15) =531944713a(16) =1976492194a(17) =7247306179a(18) =26852843439a(19) =98765306232a(20) =365369088071

External references