439206

Appears in sequences

• a(n) = a(n-1) + a(n-2) - 2, a(0) = 4, a(1) = 3.at n=27A000211
• Number of (marked) cyclic n-bit binary strings containing no runs of length > 2.at n=26A007040
• Number of maximum matchings in the n-Moebius ladder M_n.at n=27A020878
• Expansion of (1 - x + 3*x^3 - 2*x^4 - 3*x^5)/(1 - 2*x + x^3).at n=27A048162
• a(n) is the number of perfect matchings of an edge-labeled 2 X (2n+1) Mobius grid graph.at n=13A162483
• Numbers k with property that sum of divisors of k-th triangular number is some m-th triangular number.at n=32A175849