20853

Appears in sequences

• Divisors of 2^30 - 1.at n=43A003538
• In A015922, not in A033553.at n=30A033554
• a(n) = binomial(n,4) + binomial(n,2).at n=27A055795
• a(n) = n * Sum_{d|n} d*2^(d-1).at n=8A074225
• E.g.f.: A(x) = 1 + Sum_{n>=1} (1/n!)*Product_{k=1..n} [exp(kx) - 1].at n=6A135752
• a(n) = (4*n^3 - 12*n^2 + 14*n + 3)/3.at n=26A161703
• Number of lunar divisors of the number 999...9 (with n 9's).at n=8A169983
• Number of (w,x,y,z) with all terms in {1,...,n} and w<2x and y>3z.at n=21A212510
• Sum of the partition parts of 3n into 3 parts.at n=20A235988
• Number of partitions of n such that 2*(greatest part) <= (number of parts).at n=46A237752
• Sum of the parts in the partitions of 4n into 4 parts with smallest part equal to 1 minus the number of these partitions.at n=15A239057
• Solution of the complementary equation a(n) = 2*a(n-2) - b(n-2) + n, where a(0) = 3, a(1) = 4, b(0) = 1, and (a(n)) and (b(n)) are increasing complementary sequences.at n=26A295069
• Expansion of 1/((1-x)*(1-2*x)*(1-6*x)*(1-24*x)).at n=3A299074
• G.f. satisfies A(x) = (1 + x)^2 + x*A(x)^3.at n=6A366696