Number of (n+1) X 3 0..2 arrays with every 2 X 2 subblock having nonzero determinant and commuting with every horizontal or vertical neighbor.

A207143

Number of (n+1) X 3 0..2 arrays with every 2 X 2 subblock having nonzero determinant and commuting with every horizontal or vertical neighbor.

Terms

    a(0) =30a(1) =48a(2) =56a(3) =95a(4) =110a(5) =187a(6) =218a(7) =371a(8) =434a(9) =740a(10) =866a(11) =1478a(12) =1730a(13) =2954a(14) =3458a(15) =5906a(16) =6914a(17) =11810a(18) =13826a(19) =23618a(20) =27650a(21) =47234a(22) =55298a(23) =94466a(24) =110594a(25) =188930a(26) =221186a(27) =377858a(28) =442370a(29) =755714

External references