119296

Appears in sequences

• a(0) = 1, a(1) = 3; for n > 1, a(n) = 2*a(n-1) + 4*a(n-2).at n=10A063782
• E.g.f.: exp(x)/sqrt(1-x^2).at n=9A081919
• Number of compositions of n into pairwise relatively prime parts.at n=27A101268
• Number of right triangles on a (n+1)X8 grid.at n=36A189812
• Decimal representation of the x-axis, from the origin to the right edge, of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 105", based on the 5-celled von Neumann neighborhood.at n=16A278863
• Expansion of e.g.f. exp(Sum_{k>=1} x^(k^2)*(2 + x^(k^2))/(2*k^2)).at n=9A308381
• Number of polygons formed when every pair of vertices of a regular n-gon are joined by an infinite line.at n=32A344857
• Number of polygons formed when every pair of vertices of a regular (2n-1)-gon are joined by an infinite line.at n=16A344866
• Diagonal of rational function 1/(1 - (1 + x*y) * (x^2 + y^2)).at n=14A361726
• a(n) = Sum_{1 <= x_1, x_2, x_3 <= n} gcd(x_1, x_2, x_3, n)^4.at n=15A372929