503757

Appears in sequences

• Expansion of g.f. 1/((1-x)*(1-2*x)*(1-6*x)).at n=7A016200
• Least positive integer multiples of angle x such that their direction cosines form a unit vector: Sum_{k>0} cos(a(k)*x)^2 = 1, where a(1)=1 and x=3.at n=21A080138
• Number of strings of n decimal digits that contain at least one string of exactly 3 consecutive "0" digits.at n=8A255373