86715

Appears in sequences

• a(n) = 2*Farey(Fibonacci(n + 1)) - 3.at n=12A176500
• Triangle read by row. T(n,m) gives the number of isomorphism classes of simple arrangements of n pseudolines and m double pseudolines in the projective plane.at n=18A180500
• Number of simple mixed arrangements of 2 pseudolines and n double pseudolines in the projective plane.at n=3A191954
• Numbers k such that k and k+1 both have the prime signature (2,1,1,1) (A189982).at n=30A336658