22781

Appears in sequences

• Expansion of Product_{k>=1} (1 - x^k)^19.at n=10A010825
• Number of centered 6-valent trees with n nodes.at n=17A036651
• a(n) = T(2,n), array T given by A048505.at n=9A048507
• a(n) = (A085249(n) - 1)/6.at n=27A088349
• Indices of products of twin primes in the semiprimes.at n=19A131188
• Composite squarefree numbers n such that p(i)-4 divides n+4, where p(i) are the prime factors of n.at n=15A225704
• Numbers k such that 4*k + 1 is a perfect cube, sorted by absolute values.at n=22A305290
• Number of plane trees with n nodes where the sequence of branches directly under any given node is a chain of multisets.at n=14A319379
• Centered 10-gonal numbers which are sphenic numbers.at n=1A368426