1/36 the number of (n+2)X4 0..2 arrays with each 3X3 subblock containing two of one value, two of another, and five of the last.

A184450

1/36 the number of (n+2)X4 0..2 arrays with each 3X3 subblock containing two of one value, two of another, and five of the last.

Terms

    a(0) =234a(1) =600a(2) =1591a(3) =4517a(4) =16029a(5) =58413a(6) =216477a(7) =930657a(8) =3947025a(9) =16260821a(10) =75637161a(11) =341430753a(12) =1469964069a(13) =7087591425a(14) =32968435401a(15) =145042964117a(16) =711996798489

External references