121856

Appears in sequences

• Numerator of integral from 0 to 1 of (1 + x^2)^n, in lowest terms.at n=7A077595
• Numbers with 44 divisors.at n=19A175751
• Triangle read by rows, T(n,k) for 0<=k<=n, generalizes the Motzkin lattice paths with weights of A003645.at n=39A201639
• a(n) = largest k such that A049820(k) <= A262509(n).at n=24A263083
• a(1)=1; thereafter, a(n+1) = Sum_{d divides n} (n!/(d!*(n/d)!))*2^d*a(n/d).at n=8A295583
• Number of spanning trees in the halved Aztec diamond HMD_n.at n=4A340176
• The number of equilateral triangles with vertices from the vertices of the n-dimensional hypercube.at n=8A344854