2086920

Appears in sequences

• Integers that can be expressed as a product of triangular numbers in 3 different ways.at n=21A110904
• The number of binary pattern classes in the (2,n)-rectangular grid with 7 '1's and (2n-7) '0's: two patterns are in same class if one of them can be obtained by a reflection or 180-degree rotation of the other.at n=18A228582