20397

Appears in sequences

• G.f. (x + 1)^10/(x^10 + x^9 - x^7 - x^6 - x^5 - x^4 - x^3 + x + 1).at n=34A173243
• Number of length 2+2 0..n arrays with the medians of every three consecutive terms nondecreasing.at n=11A250141
• Number of tautologies in propositional calculus of length n.at n=14A256120
• Sum of the squares of the larger parts of the partitions of 2n into two squarefree parts.at n=25A280322
• Numbers that can be represented in more than one way as p^2+p*q+q^2 with p and q primes, p<=q.at n=19A349987
• Numbers k such that (in base 10) the k-th composite is a substring of the k-th prime.at n=2A378491