Number of horizontal and antidiagonal neighbor colorings of the odd squares of a 3Xn array with new integer colors introduced in row major order.

A216085

Number of horizontal and antidiagonal neighbor colorings of the odd squares of a 3Xn array with new integer colors introduced in row major order.

Terms

    a(0) =1a(1) =3a(2) =5a(3) =42a(4) =136a(5) =2440a(6) =10900a(7) =322776a(8) =1805632a(9) =77360796a(10) =514264344a(11) =29562890886a(12) =226109935520

External references