Number of (n+1) X 7 0..2 arrays with every 2 X 2 subblock having nonzero determinant and commuting with every horizontal or vertical neighbor.

A207147

Number of (n+1) X 7 0..2 arrays with every 2 X 2 subblock having nonzero determinant and commuting with every horizontal or vertical neighbor.

Terms

    a(0) =122a(1) =187a(2) =218a(3) =374a(4) =434a(5) =754a(6) =866a(7) =1490a(8) =1730a(9) =2962a(10) =3458a(11) =5906a(12) =6914a(13) =11810a(14) =13826a(15) =23618a(16) =27650a(17) =47234a(18) =55298a(19) =94466a(20) =110594a(21) =188930a(22) =221186a(23) =377858a(24) =442370a(25) =755714a(26) =884738a(27) =1511426a(28) =1769474a(29) =3022850

External references