Number of ways to reciprocally link elements of an nX7 array either to themselves or to exactly two horizontal, vertical and antidiagonal neighbors, without consecutive collinear links.
A220680
Number of ways to reciprocally link elements of an nX7 array either to themselves or to exactly two horizontal, vertical and antidiagonal neighbors, without consecutive collinear links.
Terms
- a(0) =1a(1) =441a(2) =22000a(3) =2316754a(4) =215926776a(5) =21051034046
External references
- oeis: A220680