273105

Appears in sequences

• a(n) = (n+1)^2 * (n+2)^2 * (2*n+3) / 12.at n=16A108674
• Main diagonal of polygonal lucky array defined in A128511.at n=18A128947
• a(n) = Product_{d|n} T(d) where T(x) = x*(x+1)/2 = A000217(x) = x-th triangular number.at n=33A275786
• Numbers that have exactly 9 representations as a k-gonal number, P(n,k) = n*((k-2)*n - (k-4))/2, k and n >= 3.at n=4A321159
• a(n) = n*(1 - (-1)^n - 2*(3 + (-1)^n)*n^2 + 2*n^4)/384.at n=35A350689