Half the number of 5X5 0..n symmetric arrays with no 2X2 subblock summing to 2n.
A213700
Half the number of 5X5 0..n symmetric arrays with no 2X2 subblock summing to 2n.
Terms
- a(0) =529a(1) =750261a(2) =109820000a(3) =4286833981a(4) =83545858925a(5) =976919547736
External references
- oeis: A213700