Number of 6 X 6 0..n symmetric arrays with all rows summing to 3*n.
A213804
Number of 6 X 6 0..n symmetric arrays with all rows summing to 3*n.
Terms
- a(0) =1a(1) =1760a(2) =526443a(3) =34725760a(4) =932587453a(5) =13937940952a(6) =138198204339
External references
- oeis: A213804