Number of symmetric (0,1)-matrices with sum of entries equal to n and no zero rows or columns, with weakly decreasing row sums and column sums.
A370723
Number of symmetric (0,1)-matrices with sum of entries equal to n and no zero rows or columns, with weakly decreasing row sums and column sums.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =14a(4) =39a(5) =123a(6) =393a(7) =1352a(8) =4782a(9) =17824a(10) =68481a(11) =274166
External references
- oeis: A370723