318281038

Appears in sequences

• Sum of the squares of the a(n)-th and the (a(n)+1)st triangular numbers (A000217) is a perfect square.at n=10A065113
• Expansion of e.g.f. cosh(sqrt(2)*x) + exp(x)*(cosh(sqrt(2)*x) - 1).at n=23A088015
• Expansion of (1+4*x+x^2)/((1-x^2)*(1-2*x-x^2)); a Pellian-related sequence.at n=21A114696
• Number of dominating subsets with k vertices in all the graphs G(n) (n>=1) obtained by taking n copies of the path P_3 and identifying one of their endpoints (a star with n branches of length 2).at n=21A213667
• Expansion of (x^4+x^3-x^2+x)/(x^3+x^2-3*x+1).at n=23A265278
• Expansion of 2*x^2 / (x^3 + x^2 - 3x + 1).at n=23A293004