T(n,k) = Number of ways to reciprocally link elements of an n X k array either to themselves or to exactly two king-move neighbors.

A220595

T(n,k) = Number of ways to reciprocally link elements of an n X k array either to themselves or to exactly two king-move neighbors.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =8a(5) =1a(6) =1a(7) =33a(8) =33a(9) =1a(10) =1a(11) =155a(12) =423a(13) =155a(14) =1a(15) =1a(16) =710a(17) =6156a(18) =6156a(19) =710a(20) =1a(21) =1a(22) =3265a(23) =87542a(24) =308246a(25) =87542a(26) =3265a(27) =1a(28) =1a(29) =15009

External references