1/36 the number of (n+2)X6 0..2 arrays with each 3X3 subblock containing two of one value, two of another, and five of the last.

A184452

1/36 the number of (n+2)X6 0..2 arrays with each 3X3 subblock containing two of one value, two of another, and five of the last.

Terms

    a(0) =3159a(1) =4517a(2) =6880a(3) =11766a(4) =28668a(5) =80058a(6) =253176a(7) =1011114a(8) =4109928a(9) =16573530a(10) =76394256a(11) =343071594a(12) =1473267984a(13) =7095859362a(14) =32986799520a(15) =145080603426a(16) =712092090408

External references