Number of nonnegative integer matrices with n distinct columns and any number of nonzero rows with each column sum being 3 and rows in nonincreasing lexicographic order.
A331196
Number of nonnegative integer matrices with n distinct columns and any number of nonzero rows with each column sum being 3 and rows in nonincreasing lexicographic order.
Terms
- a(0) =1a(1) =3a(2) =28a(3) =599a(4) =23243a(5) =1440532a(6) =131530132a(7) =16720208200
External references
- oeis: A331196