1016025

Appears in sequences

• 2nd elementary symmetric function of the first n+1 positive integers congruent to 2 mod 3.at n=29A024391
• a(n) = smaller member of n-th pair of distinct, positive, triangular numbers whose sum and difference are also triangular numbers.at n=20A185129
• Number of unordered pairs of distinct strict integer partitions of n.at n=42A366132