843228

Appears in sequences

• a(n) = 1*4*7 + 4*7*10 + 7*10*13 + ... (n terms).at n=18A196513
• Expansion of Product_{k>=1} ((1 + x^(2*k-1))/(1 - x^(2*k-1)))^(k*(k-1)/2).at n=35A294779