Number of (3n) X 3 binary matrices with all row sums equal and all column sums equal.
A181237
Number of (3n) X 3 binary matrices with all row sums equal and all column sums equal.
Terms
- a(0) =14a(1) =182a(2) =3362a(3) =69302a(4) =1513514a(5) =34306274a(6) =798145922a(7) =18931023542a(8) =455746863002
External references
- oeis: A181237