190816

Appears in sequences

• Number of permutations of [n] avoiding {4231, 3142, 1234}.at n=15A294726
• Array read by antidiagonals: A(n,k) is the number of nonnegative integer matrices with k columns and any number of distinct nonzero rows with column sums n and columns in nonincreasing lexicographic order.at n=38A331572
• 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.at n=6A331709