1/7 the number of n X 2 0..6 arrays with every element equal to exactly one or two of its horizontal and vertical neighbors.

A185405

1/7 the number of n X 2 0..6 arrays with every element equal to exactly one or two of its horizontal and vertical neighbors.

Terms

    a(0) =1a(1) =13a(2) =150a(3) =1848a(4) =22656a(5) =278832a(6) =3430776a(7) =42221928a(8) =519611520a(9) =6394769688a(10) =78699293256a(11) =968538893952

External references