40432

Appears in sequences

• Number of semi-meanders of order n with 2 components.at n=10A046721
• Expansion of 2x(1-x)/(1-2x-x^2+x^3).at n=14A052994
• 3-wave sequence beginning with 2's.at n=26A060827
• a(n) = 7*( ((3 + sqrt(5))/2)^n + ((3 - sqrt(5))/2)^n - 2 ).at n=8A206723
• a(n) = Sum_{k=1..n} k * lcm(k,n).at n=18A344508
• Conductor of elliptic curve y^2 = x^3 - n*x - n.at n=18A387891