Number of (n+1) X 4 0..2 arrays with no 2 X 2 subblock having the number of clockwise edge increases equal to the number of counterclockwise edge increases in its adjacent leftward or upward neighbors.

A206272

Number of (n+1) X 4 0..2 arrays with no 2 X 2 subblock having the number of clockwise edge increases equal to the number of counterclockwise edge increases in its adjacent leftward or upward neighbors.

Terms

    a(0) =1233a(1) =3168a(2) =12429a(3) =39306a(4) =133866a(5) =437340a(6) =1528920a(7) =4972464a(8) =17378730a(9) =56812524a(10) =197823117a(11) =647998686a(12) =2252305758a(13) =7394389266a(14) =25660071480a(15) =84368598492a(16) =292322882925a(17) =962789033730

External references