22400

Appears in sequences

• Squares written in base 5.at n=40A001740
• Denominators of coefficients of polynomials arising from Chebyshev quadrature.at n=9A002680
• a(1) = 1, a(m+1) = 2*Sum_{k=1..floor((m+1)/2)} a(m+1-k).at n=10A039721
• Open 3-dimensional ball numbers (version 4): a(n) is the number of integer points (i,j,k) contained in an open ball of diameter n, centered at (1/2, 1/2, 1/2).at n=35A053596
• Numbers n such that the Diophantine equation x^4+y^5=n^4 has solutions.at n=34A070756
• Numbers whose product of exponents is equal to the sum of prime factors.at n=27A071175
• Numbers k such that A074037(k) = A002034(k).at n=26A074055
• Stirling2 triangle with scaled diagonals (powers of 4).at n=24A075499
• Fourth column of triangle A075499.at n=3A075907
• Numbers k such that Omega(k) = Omega(k-1) + Omega(k-2) + Omega(k-3) + Omega(k-4) where Omega(k) denotes the number of prime factors of k, counting multiplicity.at n=22A078095
• a(n)=(3*n+1)!/(n!*3^n).at n=3A079929
• Numbers n which are a proper multiple (>1) of A068505(n) (= n read in base m+1 where m = largest digit of n).at n=36A089584
• Structured rhombic triacontahedral numbers (vertex structure 7).at n=13A100165
• T(n, k) is the coefficient of z^k in the numerator of the polynomial part of z^n*exp(-n*s), where s = hypergeom([1, 1, 3/2], [2, 5/2], 1/z^2)/(6z^2); related to Chebyshev's quadrature. Triangle read by rows, T(n,k) for 0 <= k <= n.at n=54A101270
• Number of permutations of n elements without cycles whose length is a multiple of 3.at n=8A102736
• Number of permutations of n elements admitting a cube root.at n=8A103619
• a(n) = product of first n integers not divisible by 3.at n=6A111394
• Triangle, read by rows, where T(n,k) = n!/(k!*(n-3*k)!*3^k) for n>=3*k>=0.at n=25A118931
• The sum of the principal diagonals of an n X n spiral.at n=32A137930
• Sum of the principal diagonals of a 2n X 2n square spiral.at n=16A137931