91866

Appears in sequences

• Related to graded partially ordered sets.at n=5A001829
• Number of unordered pairs of distinct length-n binary words having the same number of 1's.at n=9A108958
• Total number of ways of partitioning n and any natural number less than or equal to n into the same number of parts, not treating partitions of n and itself in a different order as distinct.at n=19A380126