530145
domain: N
Appears in sequences
- a(n) = 9^n - n^4.at n=6A024105
- Partial sums of A007587.at n=32A051799
- a(n) = 9*binomial(n,4) = 3*n*(n-1)*(n-2)*(n-3)/8.at n=36A060008
- a(n) = (n!!)^2 - n!.at n=7A088984
- Largest k > 1 such that (sum of digits of k^n)*(sum of digits of k^(n+1)) = k, or 0 if no such k exists.at n=26A130181
- Number T(n,k) of permutations of [n] such that k is the GCD of the cycle lengths; triangle T(n,k), n>=0, 0<=k<=n, read by rows.at n=57A346085
- Number of permutations of [2n] such that the GCD of the cycle lengths equals 2.at n=5A346086