57794

Appears in sequences

• a(n) = 2*a(n-1) + 2*a(n-2) - 3*a(n-3), with a(0) = 0, a(1) = 1, a(2) = 2.at n=14A099232
• 1/Product_{n>=1} (1 - a(n)*x^n) = 1 + Sum_{k>=1} F(k+1)*x^k = 1/(1-x-x^2), where F(n) = A000045(n) (Fibonacci numbers).at n=29A157162
• G.f.: Product_{k>=1} (1 + x^k) / (1 - x^(k^2)).at n=45A280276
• Place two n-gons with radii 1 and 2 concentrically, forming an annular area between them. Connect all the vertices with line segments that lie entirely within that area. Then a(n) is the number of vertices in that figure.at n=34A337701
• a(n) is the Wiener index of a broom on 2n vertices of which n+2 are pendant.at n=41A349416
• Consecutive states of the linear congruential pseudo-random number generator (1093*s + 18257) mod 86436 when started at s=1.at n=29A385340