Number of defective 3-colorings of a 2 X n 0..2 array connected horizontally, diagonally and antidiagonally with exactly two mistakes, and colors introduced in row-major 0..2 order.

A229638

Number of defective 3-colorings of a 2 X n 0..2 array connected horizontally, diagonally and antidiagonally with exactly two mistakes, and colors introduced in row-major 0..2 order.

Terms

    a(0) =0a(1) =6a(2) =40a(3) =122a(4) =488a(5) =1608a(6) =5392a(7) =17368a(8) =55232a(9) =172896a(10) =535296a(11) =1641376a(12) =4992896a(13) =15083648a(14) =45297408a(15) =135323008a(16) =402405376a(17) =1191699968a(18) =3516119040a(19) =10339711488a(20) =30313351168a(21) =88624646144a(22) =258445856768a(23) =751910639616

External references