66985

Appears in sequences

• Expansion of (1/(1-x))*sum(k>=2,x^k/(1-2x^k)).at n=30A113240
• Number of meanders (walks starting at the origin and ending at any altitude >= 0 that may touch but never go below the x-axis) with n steps from {-3,-2,-1,1,2,3}.at n=7A278398
• Markoff spectrum N^(2)(Lambda).at n=15A293174