1/6 the number of n X 2 0..5 arrays with every element equal to exactly one or two of its horizontal and vertical neighbors.

A185535

1/6 the number of n X 2 0..5 arrays with every element equal to exactly one or two of its horizontal and vertical neighbors.

Terms

    a(0) =1a(1) =11a(2) =110a(3) =1155a(4) =12105a(5) =127190a(6) =1336205a(7) =14039455a(8) =147510990a(9) =1549891055a(10) =16284627805a(11) =171101820790

External references