T(n,k)=Number of ways to reciprocally link elements of an nXk array either to themselves or to exactly one horizontal, vertical or antidiagonal neighbor.

A220553

T(n,k)=Number of ways to reciprocally link elements of an nXk array either to themselves or to exactly one horizontal, vertical or antidiagonal neighbor.

Terms

    a(0) =1a(1) =2a(2) =2a(3) =3a(4) =8a(5) =3a(6) =5a(7) =29a(8) =29a(9) =5a(10) =8a(11) =108a(12) =224a(13) =108a(14) =8a(15) =13a(16) =401a(17) =1814a(18) =1814a(19) =401a(20) =13a(21) =21a(22) =1490a(23) =14556a(24) =32173a(25) =14556a(26) =1490a(27) =21a(28) =34a(29) =5536

External references