214200

Appears in sequences

• Total number of edges in all connected labeled graphs on n nodes.at n=5A094594
• Ratios of consecutive denominators of Stirling's expansion for the Gamma function.at n=29A154268
• Symmetrical Hahn weights on q-form factorials:m=3;q=4; q-form:t(n,m)=If[m == 0, n!, Product[Sum[(m + 1)^i, {i, 0, k - 1}], {k, 1, n}]]; Hahn weight:b(n,k,m)=If[n == 0, 1, (n!*t[m + 1, k]*t[m + 1, n - k])/(k!*(n - k)!*t[1, n])].at n=6A157322
• Symmetrical Hahn weights on q-form factorials:m=3;q=4; q-form:t(n,m)=If[m == 0, n!, Product[Sum[(m + 1)^i, {i, 0, k - 1}], {k, 1, n}]]; Hahn weight:b(n,k,m)=If[n == 0, 1, (n!*t[m + 1, k]*t[m + 1, n - k])/(k!*(n - k)!*t[1, n])].at n=9A157322
• Triangle V(l,p) (l>=0, p=0..l) read by rows: see Formula for definition, see Comments for motivation.at n=127A179898
• Numbers with prime factorization pqr^2s^2t^3.at n=4A190386
• Triangle read by rows: the X-transformation of the Catalan triangle A033184.at n=40A228334
• a(n) = 4*(n + 1)*(n + 2)*(4*n + 3)/3.at n=33A267522
• Decimal representation of the x-axis, from the origin to the right edge, of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 483", based on the 5-celled von Neumann neighborhood.at n=17A282493
• Numbers that are product of a hexagonal number (A000384) and a square pyramidal numbers (A000330) in at least two ways.at n=28A306121
• Primitive 4-abundant numbers: Numbers k such that sigma(k) > 4k (A068404) all of whose proper divisors d are 4-deficient numbers (having sigma(d) < 4d).at n=16A307114
• Expansion of e.g.f. 1/(1 + x/(1 + (x^2/2!)/(1 + (x^3/3!)/(1 + (x^4/4!)/(1 + ...))))), a continued fraction.at n=10A319173
• Primitive terms of A023198: numbers k with the property sigma(k)/k >= 4 that are not divisible by any other number with that property.at n=18A392936