2621437

Appears in sequences

• Let u(1)=u(2)=1, u(3)=n, u(k) = (1/2)*abs(2*u(k-1) -u(k-2)-u(k-3)); sequence gives values of n such that Sum_{k>=1} u(k) is an integer.at n=38A078113
• The number of edges on a piece of paper that has been folded n times (see comments for more precise definition).at n=37A133257
• Expansion of (1 - x + 3*x^2)/((1-x)*(1-2*x)).at n=20A154117