Number of n X 4 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 1 or 5 neighboring 1s.

A297591

Number of n X 4 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 1 or 5 neighboring 1s.

Terms

    a(0) =1a(1) =4a(2) =13a(3) =49a(4) =154a(5) =577a(6) =1977a(7) =6962a(8) =24441a(9) =85803a(10) =300758a(11) =1056231a(12) =3705161a(13) =13002296a(14) =45626359a(15) =160104845a(16) =561810578a(17) =1971441799a(18) =6917860901a(19) =24275155066a(20) =85182802525a(21) =298910850927

External references