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

A206336

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

Terms

    a(0) =192a(1) =96a(2) =455a(3) =296a(4) =1376a(5) =880a(6) =4111a(7) =2622a(8) =12319a(9) =7854a(10) =36945a(11) =23550a(12) =110823a(13) =70638a(14) =332457a(15) =211902a(16) =997359a(17) =635694a(18) =2992065a(19) =1907070a(20) =8976183a(21) =5721198a(22) =26928537a(23) =17163582a(24) =80785599a(25) =51490734a(26) =242356785a(27) =154472190a(28) =727070343a(29) =463416558

External references