30768

Appears in sequences

• Coefficients of elliptic function cn.at n=2A006089
• Expansion of (theta_3(z)*theta_3(19z) + theta_2(z)*theta_2(19z))^4.at n=34A028644
• 1 + Sum_{n >= 1} Sum_{k = 0..n-1} (-1)^n*T(n,k)*y^(2*k)*x^(2*n)/(2*n)! = JacobiCN(x,y).at n=12A060627
• Term at which last number of height n occurs in Recamán's sequence A005132.at n=15A064294
• Number of nonisomorphic semigroups of order <= n.at n=6A118581
• Number of planar triangular n X n X n nonnegative integer grids with every similarly oriented 3 X 3 X 3 subtriangle summing to 6.at n=6A154056
• Number of subsets of {1..n} (including empty set) such that the pairwise LCMs of elements are all distinct.at n=19A196721
• Expansion of Product_{k>=1} 1/(1-x^k)^(k*(k-1)*(k-2)/6).at n=17A258352
• Values of k at which the ratio k/A005132(k) sets a new record.at n=10A330788
• G.f. A(x) satisfies: A(x) = 1 + x * A(x^3/(1 - x)^3) / (1 - x)^3.at n=14A354695
• a(n) = Sum_{k=1..n-1} tau(k) * sigma_2(n-k).at n=29A374973