173088

Appears in sequences

• Number of necklaces with n beads of 3 colors, allowing turning over.at n=14A027671
• Numbers k such that the least term in the periodic part of the continued fraction for sqrt(k) is 26.at n=32A031704
• a(n) = 676*n^2 + 2*n.at n=15A158385
• a(n) = 32*(32*n^2 + 1).at n=13A158685
• a(n) = 169*n^2 + n.at n=31A173275
• Number of n-bead necklaces of 4 colors allowing reversal, with no adjacent beads having the same color.at n=13A208540
• G.f. satisfies: A(x) = Sum_{n>=0} x^n * Sum_{k=0..n} x^k * {[x^k] A(x)^(3*n)}.at n=11A249936