2185095

Appears in sequences

• Triangular numbers that are 1/5 of a triangular number.at n=6A077260
• Third row of array in A101385.at n=26A101645
• 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=31A109609
• a(n) = larger member of n-th pair of distinct, positive, triangular numbers whose sum and difference are also triangular numbers.at n=25A185128
• Expansion of e.g.f. Product_{k>=1} (1 + (exp(x) - 1)^k).at n=8A305550
• G.f. A(x) satisfies: A(x) = x + x^2 * exp(A(x) - A(-x^2)/2 + A(x^3)/3 - A(-x^4)/4 + ...).at n=24A345234