Number of (n+1)X(n+1) 0..2 arrays with every 2X2 subblock having nonzero determinant and commuting with every horizontal or vertical neighbor.

A207141

Number of (n+1)X(n+1) 0..2 arrays with every 2X2 subblock having nonzero determinant and commuting with every horizontal or vertical neighbor.

Terms

    a(0) =50a(1) =48a(2) =157a(3) =190a(4) =622a(5) =754a(6) =2482a(7) =3010a(8) =9922a(9) =12034a(10) =39682a(11) =48130a(12) =158722a(13) =192514a(14) =634882a(15) =770050a(16) =2539522a(17) =3080194a(18) =10158082a(19) =12320770a(20) =40632322a(21) =49283074a(22) =162529282a(23) =197132290

External references