298452

Appears in sequences

• Number of unrooted triangulations with reflection symmetry of a disk with one internal node and n+3 nodes on the boundary.at n=21A005508
• a(n) = number of (s(0), s(1), ..., s(2*n-1)) such that s(i) is a nonnegative integer and |s(i) - s(i-1)| = 1 for i = 1,2,...,n, s(0) = 3, s(2*n-1) = 4. Also a(n) = T(2*n-1,n-1), where T is defined in A026022.at n=10A026026
• T(n,[ n/2 ]), where T is defined in A026022.at n=21A026034
• Expansion of (1+x^2*C^2)*C^2, where C = (1-(1-4*x)^(1/2))/(2*x) is g.f. for Catalan numbers, A000108.at n=11A071721
• Numbers n such that sigma(n) = 14*phi(n) (where sigma=A000203, phi=A000010).at n=17A171259
• Three-column table read by rows: Triples that have the same value of phi, sigma, and tau.at n=29A322679
• Three-column table read by rows: Primitive distinct triples that have the same value of phi, sigma, and tau.at n=29A322689
• Size of the largest component of the blet graph for n coins.at n=19A381814