Number of ways to reciprocally link elements of an nX7 array either to themselves or to exactly two horizontal, vertical and antidiagonal neighbors, without 3-loops.
A220601
Number of ways to reciprocally link elements of an nX7 array either to themselves or to exactly two horizontal, vertical and antidiagonal neighbors, without 3-loops.
Terms
- a(0) =1a(1) =305a(2) =190425a(3) =60138423a(4) =16505365334
External references
- oeis: A220601