1244936

Appears in sequences

• a(n) = 4*a(n-1) - 3*a(n-2) - a(n-3), with a(0)=0, a(1)=0 and a(2)=1.at n=15A215404
• Expansion of Product_{k>=1} (1-x^k/Product_{j=1..k} (1-x^j)).at n=35A350587