Number of nX4 0..1 arrays with every element unequal to 0, 1, 2, 5 or 8 king-move adjacent elements, with upper left element zero.

A305336

Number of nX4 0..1 arrays with every element unequal to 0, 1, 2, 5 or 8 king-move adjacent elements, with upper left element zero.

Terms

    a(0) =8a(1) =9a(2) =26a(3) =81a(4) =267a(5) =938a(6) =3186a(7) =10840a(8) =37115a(9) =127093a(10) =434701a(11) =1487032a(12) =5088052a(13) =17408881a(14) =59562461a(15) =203788091a(16) =697249613a(17) =2385595861a(18) =8162156545a(19) =27926287144a(20) =95547994595a(21) =326911280365

External references