Number of ways to reciprocally link elements of an 5Xn array either to themselves or to exactly two horizontal or antidiagonal neighbors.

A220635

Number of ways to reciprocally link elements of an 5Xn array either to themselves or to exactly two horizontal or antidiagonal neighbors.

Terms

    a(0) =1a(1) =1a(2) =8a(3) =114a(4) =1481a(5) =17527a(6) =201903a(7) =2329448a(8) =26904225a(9) =310837917a(10) =3591561452a(11) =41499180881a(12) =479508472309

External references