26545

Appears in sequences

• Rounded volume of a regular icosahedron with edge length n.at n=23A071402
• antisigma(n) + antisigma(n+3) = antisigma(n+1) + antisigma(n+2), where antisigma(n) = sum of the non-divisors of n that are between 1 and n.at n=4A076667
• Non-crossing, non-nesting, 3-colored set partitions.at n=6A225029
• Sequence with all (x, y) = (a(2m), a(2m+-1)) satisfying x|y^2+y+1 and y|x^2+1.at n=9A242725
• Indices of pentagonal numbers (A000326) which are also centered square numbers (A001844).at n=8A254709
• Solution of the complementary equation a(n) = a(n-1) + a(n-2) + n*b(n-1), where a(0) = 2, a(1) = 4, b(0) = 1, b(1) = 3, and (a(n)) and (b(n)) are increasing complementary sequences.at n=15A296292
• Number of permutations sigma of [n] such that sigma(k)/k > sigma(k+1)/(k+1) for 1 <= k <= n-1.at n=18A309807
• E.g.f. satisfies A(x) = exp(x*A(-x^2)).at n=8A367721