39563

Properties

Appears in sequences

• Related to population of numbers of form x^2 + y^2.at n=17A000694
• a(n) = Sum_{k=0..floor(n/4)} C(n-2*k,2*k)*2^k.at n=20A098575
• Expansion of (1-x-2*x^2)/(1-2*x-3*x^2-4*x^3+4*x^4).at n=10A108480
• Numbers k such that w(k), w(k+1), and w(k+2) are all odd, where w is A336957.at n=15A337644
• Number of dissections of a convex n-gon into quadrilaterals and pentagons by strictly disjoint diagonals.at n=22A387267
• Prime numbersat n=4162