Number of (n+1)X(n+1) 0..1 arrays with the permanents of all 2X2 subblocks equal and nonzero.
A204706
Number of (n+1)X(n+1) 0..1 arrays with the permanents of all 2X2 subblocks equal and nonzero.
Terms
- a(0) =7a(1) =33a(2) =257a(3) =3473a(4) =73345a(5) =2542369a(6) =140090241a(7) =12503757969
External references
- oeis: A204706