56848

Appears in sequences

• Fibonacci sequence beginning 0, 22.at n=18A022356
• Coordination sequence for lattice D*_4 (with edges defined by l_1 norm = 1).at n=22A035471
• Number of double tangents of order n.at n=19A060784
• a(n) = 2*a(n-1) + 6*a(n-2).at n=9A083098
• Number of ways, counted up to symmetry, to build a contiguous building with n LEGO blocks of size 1 X 2.at n=5A123762
• E.g.f.: Sum_{n>=1} log((1 + exp(2*x^n))/2).at n=7A203715
• T(n,k) = number of circular arrays of n 1's, n -1's, and k 0's such that no two adjacent elements are equal.at n=43A283614
• Number of connected subsets of edges (or edge-induced subgraphs, or polysticks) of the n-th Johnson solid, up to symmetries of that solid.at n=3A384379