21669

Appears in sequences

• Maximum determinant that can be formed from the optimal set of nonnegative 3 X 3 matrix elements <=n, which maximize the number of different determinants given in A099834.at n=27A099815
• Numbers k such that k^3 contains a pandigital substring.at n=17A115933
• Number of partitions of n in which exactly one odd part is repeated and even parts are unrestricted.at n=40A353903
• a(n) = Sum_{k=0..n} (-1)^k * binomial(n+k-1,n-k) * Fibonacci(k+1).at n=16A390850