22889

Appears in sequences

• Cycle class sequence c(n) (number of true cycles of length n in which a certain node is included) for zeolite NON = Nonasil-[ 4158 ] [Si88O176].4R starting with a T1 atom.at n=13A019209
• a(n) = s(1)*s(2)*...*s(n)*(1/s(1) - 1/s(2) + ... + c/s(n)), where s(1) = 1, s(k) = p(k-1) for k >= 2 and c = (-1)^(n+1).at n=6A024529
• Semiprimes in A103372.at n=17A103392
• Number of ways to partition an n X 6 grid into 3 connected equal-area regions.at n=4A167253
• T(n,m) = Number of ways to partition an nXm grid into 3 connected equal-area regions.at n=49A167259
• T(n,m) = Number of ways to partition an nXm grid into 3 connected equal-area regions.at n=50A167259
• Partitions with subdiagonal growth: number of partitions (p0, p1, p2, ...) of n with pi - p0 <= i.at n=41A238876
• Decimal representation of the diagonal from the corner to the origin of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 838", based on the 5-celled von Neumann neighborhood.at n=34A290546
• a(n) is the number of different linear hydrocarbon molecules with n carbon atoms.at n=13A306334
• a(n) = 4*a(n-1) - 6*a(n-2) + 4*a(n-3) - a(n-4) + a(n-5) with a(1) = 1, a(2) = 2, a(3) = 4, a(4) = 8, and a(5) = 15.at n=16A385107
• a(n) is the number of 4 element sets of integer sided trapezoids with distinct areas and base angles that are 60 degrees, which fill an equilateral triangular grid of side n units.at n=48A389518