205253

Properties

Appears in sequences

• Boustrophedon transform of triangular numbers.at n=9A000746
• Number of partitions of the n-th triangular number n(n+1)/2 into distinct odd parts.at n=19A126683
• Number of sequences of length n with elements {-2,-1,+1,+2}, counted up to simultaneous reversal and negation, such that the sum of elements of the whole sequence but of no proper subsequence equals 0 modulo n. For n>=4, the number of Hamiltonian (undirected) cycles on the circulant graph C_n(1,2).at n=31A137726
• Expansion of (3-2*x)/(1-x-x^3)+x/(1-x)^2+x/(1-x^2).at n=32A226509
• Define a sequence of real numbers by b(1)=2, b(n+1) = b(n) + log_2(b(n)); a(n) = smallest i such that b(i) >= 2^n.at n=21A229168
• Number of (undirected) Hamiltonian cycles in the n-antiprism graph.at n=15A306447
• Prime numbersat n=18404