25674

Appears in sequences

• Number of rooted trees with leaves of 2 colors where any 2 subtrees extending from the same node have a different number of nodes.at n=12A032306
• Number of vertices of the n-th multiplihedron.at n=9A121988
• Square of Riordan array (1, x*c(x)) where c(x) is the g.f. of A000108.at n=46A127631
• Expansion of c(x)*c(x*c(x)) where c(x) is the g.f. of A000108.at n=8A129442
• Square array of coefficients in the successive iterations of x*C(x) = (1-sqrt(1-4*x))/2 where C(x) is the g.f. of the Catalan numbers (A000108); read by antidiagonals.at n=53A158825
• Numbers k such that Bernoulli number B_{k} has denominator 64722.at n=21A295592
• Numbers k such that 303*2^k+1 is prime.at n=41A322916
• a(n) = Sum_{1 <= i <= j <= k <= n} gcd(i,j,k).at n=46A344521