Number of nonnegative integer matrices with n columns and any number of distinct nonzero rows with column sums 3 and columns in nonincreasing lexicographic order.
A331710
Number of nonnegative integer matrices with n columns and any number of distinct nonzero rows with column sums 3 and columns in nonincreasing lexicographic order.
Terms
- a(0) =1a(1) =3a(2) =45a(3) =1987a(4) =190379a(5) =30474159a(6) =7287577611
External references
- oeis: A331710