Number of (n+1) X 4 0..1 arrays with the permanents of all 2 X 2 subblocks equal and nonzero.

A204708

Number of (n+1) X 4 0..1 arrays with the permanents of all 2 X 2 subblocks equal and nonzero.

Terms

    a(0) =25a(1) =81a(2) =257a(3) =833a(4) =2689a(5) =8705a(6) =28161a(7) =91137a(8) =294913a(9) =954369a(10) =3088385a(11) =9994241a(12) =32342017a(13) =104660993a(14) =338690049a(15) =1096024065a(16) =3546808321a(17) =11477712897a(18) =37142659073a(19) =120196169729a(20) =388962975745

External references