58320

Appears in sequences

• a(n) = Sum_{k=0..m} (k+1) * A026082(n, k), where 0 <= k <= m, m=n for n=0,1,2,3; m=2n for n >= 4.at n=9A027319
• Duplicate of A027319.at n=9A027320
• Triangle whose (i,j)-th entry is binomial(i,j)*6^(i-j)*9^j.at n=16A038263
• Triangle whose (i,j)-th entry is binomial(i,j)*9^(i-j)*6^j.at n=19A038296
• A convolution triangle of numbers obtained from A025751.at n=17A049224
• Ninth column of triangle A067410.at n=4A067416
• Engel expansion of sinh(1/3).at n=40A068380
• Triangular array T(n,k) read by rows, giving number of labeled free trees such that the root is smaller than all its children, with respect to the number n of vertices and to the degree k of the root.at n=41A071210
• a(n) is the smallest x such that the quotient d(x)/d(x+1) equals n, where d = A000005.at n=34A080372
• Area of the Pythagorean triangle a = u^2 - v^2 (cf. A096382) when u=3, v=4,4,5,...at n=23A096383
• Numbers whose set of base 9 digits is {0,8}.at n=24A097255
• Numbers n such that n=phi(phi(n)+sigma(n)) and n is not of the form 2*p where p is a Sophie Germain odd prime.at n=10A097652
• Expansion of e.g.f. (1+3*x)/(1-3*x).at n=5A098559
• Riordan array (1/(1-3x),x(1-x)/(1-3x)^2).at n=37A114195
• a(n) = n^5 - n^3.at n=9A133754
• a(1) = 1; for n > 1, a(n) = 2*a(n-1) + lcm(a(n-1),n).at n=8A135507
• Triangular sequence of coefficients of p(x,t) = t*exp(3*x*t - t^2)/(exp(t) - 1).at n=14A137784
• a(n) = 3^n*(n + 2)!.at n=4A153647
• Array read by antidiagonals: T(n,k) = (k+1)^n*(n+k)!.at n=23A154120
• Totally multiplicative sequence with a(p) = 9*(p+2) for prime p.at n=11A167310