40894464

Appears in sequences

• Numbers k such that Sum_{i=1..k} gcd(k,i) divides Sum_{i=1..k} lcm(k,i).at n=35A072109
• Denominators in the Maclaurin series for arctan(1+x).at n=38A075554
• Expansion of (1-3x+4x^2-3x^3+x^4)/(1-2x)^2.at n=23A084861
• a(n) = n-th n-almost prime.at n=21A101695
• a(n) = (2*n + 1) * 2^(n + 1).at n=19A118417
• a(n) = n-th integer from among those positive integers with an exponent of n in their prime-factorizations.at n=19A123904
• a(n) = n*2^floor((n+1)/2).at n=39A132314
• a(0) = 9, a(n) = 2*a(n-1) + 2^(n-1) for n > 0.at n=21A159697
• a(n) = (n/4)*2^(n/2)*((1+sqrt(2))^2 + (-1)^n*(1-sqrt(2))^2).at n=39A187272
• Number of 4-cycles in the n-Sierpinski tetrahedron graph.at n=11A292542