Number of 4Xn 0..1 arrays with every element equal to 0, 1 or 3 horizontally or antidiagonally adjacent elements, with upper left element zero.

A301887

Number of 4Xn 0..1 arrays with every element equal to 0, 1 or 3 horizontally or antidiagonally adjacent elements, with upper left element zero.

Terms

    a(0) =8a(1) =34a(2) =95a(3) =203a(4) =510a(5) =1754a(6) =5463a(7) =16452a(8) =49611a(9) =153498a(10) =478314a(11) =1488796a(12) =4635051a(13) =14448493a(14) =45103531a(15) =140813098a(16) =439606342a(17) =1372574192a(18) =4286144428a(19) =13385273545a(20) =41801527070a(21) =130545539541a(22) =407696977117

External references