318801

Appears in sequences

• a(n) = (n^2-1)*(2*n^2-1).at n=20A033595
• Triangular numbers that are 1/5 of a triangular number.at n=5A077260
• Expansion of 1/((x-1)*(x+1)*(x^2+x+1)*(x^2+x-1)*(x^2-x+1)*(x^2+1)*(x^4-x^2+1)).at n=27A109609
• a(n) = larger member of n-th pair of distinct, positive, triangular numbers whose sum and difference are also triangular numbers.at n=14A185128