167763

Appears in sequences

• a(n) = a(n-1) + a(n-2) - 2, a(0) = 4, a(1) = 3.at n=25A000211
• Number of maximum matchings in the n-Moebius ladder M_n.at n=25A020878
• Expansion of (1 - x + 3*x^3 - 2*x^4 - 3*x^5)/(1 - 2*x + x^3).at n=25A048162
• a(n) is the number of perfect matchings of an edge-labeled 2 X (2n+1) Mobius grid graph.at n=12A162483
• E.g.f. A(x) satisfies A(x) = exp( x / (1+x)^2 * A(x)^2 ).at n=7A390063