Number of nX6 0..1 arrays with every element equal to 0, 1 or 4 horizontally or antidiagonally adjacent elements, with upper left element zero.

A301962

Number of nX6 0..1 arrays with every element equal to 0, 1 or 4 horizontally or antidiagonally adjacent elements, with upper left element zero.

Terms

    a(0) =13a(1) =22a(2) =74a(3) =219a(4) =749a(5) =2544a(6) =8705a(7) =29750a(8) =101869a(9) =348726a(10) =1194018a(11) =4088095a(12) =13997248a(13) =47925030a(14) =164090446a(15) =561828851a(16) =1923644742a(17) =6586363735a(18) =22551038555a(19) =77212460575a(20) =264367602921a(21) =905167759481

External references