852480

Appears in sequences

• Value of phi in arithmetic progression of at least 5 terms having the same value of phi in A050515.at n=20A050517
• Triangle d_k(n) read by rows: number of n-th order Feynman diagrams with k interactions, 0<=k<=n.at n=18A214299
• Terms satisfy: a(2*n) = a(n)*b(n) and a(2*n+1) = a(n+1)*b(n) for n>=0 with a(0)=1, where A(x)^2 = Sum_{n>=0} b(n)*x^n and g.f. A(x) = Sum_{n>=0} a(n)*x^n.at n=17A265264
• G.f.: 1 = ...((((1/(1-x) - a(1)*x )^2 - a(2)*x^2 )^2 - a(3)*x^3 )^2 - a(4)*x^4 )^2 -..., an infinite series of nested squares.at n=11A274961