T(n,k)=Number of ways to reciprocally link elements of an nXk array either to themselves or to exactly two horizontal, vertical and antidiagonal neighbors, without consecutive collinear links.

A220681

T(n,k)=Number of ways to reciprocally link elements of an nXk array either to themselves or to exactly two horizontal, vertical and antidiagonal neighbors, without consecutive collinear links.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =4a(5) =1a(6) =1a(7) =9a(8) =9a(9) =1a(10) =1a(11) =25a(12) =43a(13) =25a(14) =1a(15) =1a(16) =64a(17) =201a(18) =201a(19) =64a(20) =1a(21) =1a(22) =169a(23) =968a(24) =2024a(25) =968a(26) =169a(27) =1a(28) =1a(29) =441

External references