100889

Appears in sequences

• G.f.: 1 + Sum_{n>=1} x^n * exp( Sum_{k>=1} binomial(2*n*k-1, n*k) * x^(n*k)/k ).at n=12A206777
• Numbers n such that phi(n) = 4*phi(n+1).at n=3A256937
• Number of active (ON, black) cells at stage 2^n-1 of the two-dimensional cellular automaton defined by "Rule 934", based on the 5-celled von Neumann neighborhood.at n=8A273793
• Number of vertices formed when connecting all 4n points on the perimeter of an n X n square by infinite lines.at n=10A345649