Number of n X n symmetric 0-1 matrices where rows are sorted lexicographically and row sums are nondecreasing.
A351158
Number of n X n symmetric 0-1 matrices where rows are sorted lexicographically and row sums are nondecreasing.
Terms
- a(0) =2a(1) =5a(2) =15a(3) =56a(4) =275a(5) =1897a(6) =18948
External references
- oeis: A351158