Number of 3Xn 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 1, 3 or 4 neighboring 1s.

A297751

Number of 3Xn 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 1, 3 or 4 neighboring 1s.

Terms

    a(0) =1a(1) =11a(2) =66a(3) =174a(4) =452a(5) =2223a(6) =9733a(7) =32213a(8) =109959a(9) =444222a(10) =1741686a(11) =6270922a(12) =22908011a(13) =87743411a(14) =332882553a(15) =1231723189a(16) =4581917598a(17) =17276990320a(18) =64938750220a(19) =242324446545a(20) =905905664957

External references