457653

Appears in sequences

• Number of binary trees of height n; or products (ways to insert parentheses) of height n when multiplication is non-commutative and non-associative.at n=5A001699
• a(n) = (n^2 - n + 1)*(n^2 + n + 1).at n=26A059826
• Central polygonal numbers that are nontrivially the product of two central polygonal numbers.at n=36A203173