22680

Appears in sequences

• a(n) = n*(n+1)^2/2.at n=35A006002
• a(n) = (2n+1)! / 2^n.at n=4A007019
• Smallest k such that sigma(x) = k has exactly n solutions.at n=41A007368
• Expand sin x / exp x = x-x^2+x^3/3-x^5/30+... and invert nonzero coefficients.at n=9A007415
• Denominators of expansion of exp x / sin x.at n=8A007451
• Exponential generating function is tanh(log(1+x)).at n=9A009775
• a(n) = floor( n*(n-1)*(n-2)*(n-3)/29 ).at n=30A011939
• Triangle of coefficients in expansion of (2+3x)^n.at n=32A013620
• Triangle read by rows giving number of rooted labeled trees with n >= 2 nodes and height d >= 1.at n=19A034855
• a(n) = n!*(2*n-5)/2.at n=4A034860
• Maximum of different products of partitions of n into distinct parts.at n=34A034893
• Number of strings of n distinct digits from 0-9 that are the last n digits of a square in base 9.at n=5A036753
• Smallest number that is palindromic (with at least 2 digits) in n bases.at n=40A037183
• Triangle whose (i,j)-th entry is binomial(i,j)*3^(i-j)*2^j.at n=31A038220
• Denominators of Taylor series for exp(x)*sin(x).at n=9A046979
• Denominators of Taylor series for exp(x)*cos(x).at n=9A046981
• Expansion of e.g.f. (1-x)^2/(1-4*x+3*x^2-x^3).at n=5A052696
• Least k for which the integers Floor(k/(m*(m+1))) for m=1,2,...,n are distinct.at n=39A054061
• Index values for new maxima in sequence A007365.at n=26A065932
• Numbers which can be expressed as the product of a number and its reversal in at least two different ways.at n=15A066531