279378

Appears in sequences

• a(n) = n*(n+1)*(n^2 - 3*n + 6)/4.at n=33A062026
• Triangular numbers containing 2k digits in which the sum of the first k digits = that of the rest.at n=27A068898
• Triangular numbers for which the sum of the digits is a square.at n=33A117404
• Number of length-4 0..n arrays with no repeated value differing from the previous repeated value by other than plus two, zero or minus 1.at n=21A269620