1690981

Appears in sequences

• a(n) = 5^n - 4^n.at n=9A005060
• Nexus numbers (n+1)^9-n^9.at n=4A022525
• 4-Stirling numbers of the second kind.at n=46A143496
• Difference of two positive 9th powers.at n=7A181128
• Expansion of d/dx log(1/(1-x/sqrt(1-4*x^2))).at n=17A189053
• Monotonic ordering of nonnegative differences 5^i-8^j, for 40>= i>=0, j>=0.at n=33A192197
• Triangular array read by rows, T(n,k) is the number of functions from {1,2,...,n} into {1,2,...,n} with maximum value of k.at n=40A199656
• a(n) = a(n-1) + 20*a(n-2), n >= 2; a(0)=1, a(1)=41.at n=8A320468
• a(n) is the numerator of the relativistic sum of n velocities of 1/n, in units where the speed of light is 1.at n=8A348131