18083

Appears in sequences

• a(n) = a(n-1) + a(n - 1 minus the number of terms of a(k) == n (mod 3) so far).at n=41A060730
• Structured pentakis dodecahedral numbers (vertex structure 6).at n=12A100173
• Number of nonempty subsets of {1, 2, ..., n} with <= 4 pairwise coprime elements.at n=41A187265
• a(0) = 1; for n > 0, a(n) = 41*n^2 + 2.at n=21A206399
• a(n) = floor(4^n/(2+2*cos(2*Pi/7))^n).at n=47A240671
• Least number x such that x^n has n digits equal to k. Case k = 7.at n=24A285454
• Expansion of 1 / ((1-x)^2*(1-x^2)*(1-x^3)*...*(1-x^8)).at n=31A288343
• Solution of the complementary equation a(n) = a(n-1) + a(n-2) + b(n-2)*b(n-1), where a(0) = 1, a(1) = 4, b(0) = 2, b(1) = 3, and (a(n)) and (b(n)) are increasing complementary sequences.at n=14A296262