Number of (n+1) X 4 0..2 arrays with rows and columns of permanents of all 2 X 2 subblocks lexicographically nondecreasing, and all 2 X 2 permanents nonzero.

A205230

Number of (n+1) X 4 0..2 arrays with rows and columns of permanents of all 2 X 2 subblocks lexicographically nondecreasing, and all 2 X 2 permanents nonzero.

Terms

    a(0) =1187a(1) =27157a(2) =640652a(3) =12273323a(4) =221519116a(5) =3408343704a(6) =48815088704a(7) =628179958745

External references