1427679

Appears in sequences

• Odd numbers to the right of the central elements of the (2,1)-Pascal triangle A029653 that are different from 1.at n=44A029668
• a(n) = (4*n+1)*binomial(3*n,n)/(2*n+1).at n=8A052227
• Denominators associated with A120031.at n=14A120032
• Central terms of the triangle A182579.at n=17A182584
• Coefficient array for the third power of the monic integer Chebyshev polynomials 2*T(2*n+1,x/2)/x as a function of x^2.at n=42A219235
• a(n) is the total number of down steps between the 2nd and 3rd up steps in all 2-Dyck paths of length 3*n. A 2-Dyck path is a nonnegative lattice path with steps (1, 2), (1, -1) that starts and ends at y = 0.at n=10A334640
• a(n) is the denominator of Product_{i=0..n-1} (n-i)^((-1)^ceiling(i/2)).at n=27A337355
• G.f.: Sum_{n=-oo..+oo} x^(n^2) * C(x)^(6*n-9), where C(x) = 1 + x*C(x)^2 is the g.f. of the Catalan numbers (A000108).at n=24A356779