42991616

Appears in sequences

• Expansion of g.f. (1+2*x)/(1-2*x)^2.at n=20A014480
• a(n) = n*2^(floor(n/2)).at n=41A132344
• Denominators of a series expansion for Pi/2.at n=30A156269
• Denominators of a BBP series for Pi/4.at n=20A164916
• (n-1)-st elementary symmetric function of the first n terms of (2,2,1,2,2,1,2,2,1,...)=(A130196 for n>0).at n=30A203167
• Binomial transform of [0, 1, 2, -3, -4, 5, 6, -7, -8, ...].at n=41A316386