Number of ways to reciprocally link elements of an nX4 array either to themselves or to exactly two horizontal, vertical and antidiagonal neighbors, without consecutive collinear links.

A220677

Number of ways to reciprocally link elements of an nX4 array either to themselves or to exactly two horizontal, vertical and antidiagonal neighbors, without consecutive collinear links.

Terms

    a(0) =1a(1) =25a(2) =201a(3) =2024a(4) =21380a(5) =220299a(6) =2316754a(7) =24198121a(8) =253601977a(9) =2654925237a(10) =27806859021a(11) =291197368229

External references