Number of (n+1) X 4 0..2 arrays with every 2 X 2 subblock having nonzero determinant and commuting with every horizontal or vertical neighbor.

A207144

Number of (n+1) X 4 0..2 arrays with every 2 X 2 subblock having nonzero determinant and commuting with every horizontal or vertical neighbor.

Terms

    a(0) =80a(1) =56a(2) =157a(3) =110a(4) =311a(5) =218a(6) =619a(7) =434a(8) =1235a(9) =866a(10) =2468a(11) =1730a(12) =4934a(13) =3458a(14) =9866a(15) =6914a(16) =19730a(17) =13826a(18) =39458a(19) =27650a(20) =78914a(21) =55298a(22) =157826a(23) =110594a(24) =315650a(25) =221186a(26) =631298a(27) =442370a(28) =1262594a(29) =884738

External references