Number of 3Xn 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 2 or 4 neighboring 1s.

A297735

Number of 3Xn 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 2 or 4 neighboring 1s.

Terms

    a(0) =1a(1) =3a(2) =17a(3) =34a(4) =92a(5) =223a(6) =700a(7) =1747a(8) =4931a(9) =12767a(10) =35978a(11) =94910a(12) =262007a(13) =698588a(14) =1916541a(15) =5144619a(16) =14035991a(17) =37816996a(18) =102894248a(19) =277866327a(20) =754687018a(21) =2040711739a(22) =5537019209a(23) =14984261865a(24) =40631762944a(25) =110008357730a(26) =298195807995

External references