22860

Appears in sequences

• Expansion of e.g.f.: x^2*(exp(x)-1)^2.at n=10A052760
• Number of partitions of n in which each part occurs an odd number (or zero) times.at n=48A055922
• Expansion of (1+x)c(x^2)/((1-xc(x^2))*sqrt(1-4x^2)), c(x) the g.f. of A000108.at n=14A117186
• Product of n and the sum of all divisors of all positive integers <= n.at n=29A256533
• a(n) = the smallest number k such that the base-10 digital sum of sigma(k) is n.at n=38A256635
• Central terms of triangle A102363.at n=7A265939
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 89", based on the 5-celled von Neumann neighborhood.at n=31A270131
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 89", based on the 5-celled von Neumann neighborhood.at n=32A270131
• Solution of the complementary equation a(n) = a(n-1) + a(n-2) + b(n) - 1, where a(0) = 1, a(1) = 5, b(0) = 2, b(1) = 3, b(2) = 4, and (a(n)) and (b(n)) are increasing complementary sequences.at n=17A295966
• a(n) is the number of edges formed by n-secting the angles of a hexagon.at n=39A335735
• Table read by rows, in which the n-th row lists all the primitive solutions k, in increasing order, such that k*sigma(k) = A337875(n).at n=25A337876
• Integral area of primitive integer-sided triangles whose sides a < b < c are in arithmetic progression.at n=45A351178
• Expansion of (1/x) * Series_Reversion( x*(1-x)^2/(1-x-x^4) ).at n=12A366088
• Numbers k such that A380845(k) > 3*k.at n=15A380930