Number of nonnegative integer matrices with 2 distinct columns and any number of nonzero rows with column sums n and columns in decreasing lexicographic order.
A331397
Number of nonnegative integer matrices with 2 distinct columns and any number of nonzero rows with column sums n and columns in decreasing lexicographic order.
Terms
- a(0) =1a(1) =2a(2) =14a(3) =128a(4) =1288a(5) =13472a(6) =143840a(7) =1556480a(8) =17006720a(9) =187208192a(10) =2072948224a(11) =23063920640a(12) =257634273280
External references
- oeis: A331397