Number of nonnegative integer matrices with n columns and any number of distinct nonzero rows with column sums 2 and columns in nonincreasing lexicographic order.
A331709
Number of nonnegative integer matrices with n columns and any number of distinct nonzero rows with column sums 2 and columns in nonincreasing lexicographic order.
Terms
- a(0) =1a(1) =1a(2) =7a(3) =59a(4) =701a(5) =10460a(6) =190816a(7) =4098997a(8) =101523139a(9) =2847014941a(10) =89188733362
External references
- oeis: A331709