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 3-loops.

A220602

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 3-loops.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =2a(5) =1a(6) =1a(7) =7a(8) =7a(9) =1a(10) =1a(11) =17a(12) =65a(13) =17a(14) =1a(15) =1a(16) =44a(17) =471a(18) =471a(19) =44a(20) =1a(21) =1a(22) =117a(23) =3469a(24) =9047a(25) =3469a(26) =117a(27) =1a(28) =1a(29) =305

External references