18479

Appears in sequences

• Numbers k such that A055079(k) = 2^k.at n=40A057838
• a(n) = A126098(n) - 1.at n=21A117010
• Descending dungeons: see Comments lines for definition.at n=19A121263
• Poincaré series [or Poincare series] P(C_{3,2}(0); t).at n=30A124636
• a(n) = n!*Sum_{d|n} (-1)^(d+1)/d!.at n=7A132958
• a(n) = 64*n^2 - n.at n=16A157948
• a(n) = 289*n^2 - 17.at n=7A158587
• From the coefficients (times n!) of the expansion of the Sum_{k>=1} cos(x^k).at n=4A176474
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 726", based on the 5-celled von Neumann neighborhood.at n=34A273451
• Number of length-n ternary sequences where the sum of each block differs by at most 1 from every other block of the same length.at n=44A274008
• a(n) is the least number whose sum of digits in primorial base equals n.at n=30A343048
• a(n) = Sum_{k=0..floor(n/3)} binomial(n,k) * binomial(n-k-1,n-3*k).at n=12A389327