28863

Appears in sequences

• Expansion of -(4*x^3+8*x^2+4*x+1)/(2*x^4+4*x^3+2*x^2-x-1).at n=17A270307
• Consider n equally spaced points along a line and join every pair of points by a semicircle above the line; a(n) is the number of intersection points.at n=31A290447
• Number of distinct terms in row n of Stern's diatomic array, A049456.at n=23A293160
• Duplicate of A293160.at n=23A294443
• Number of ways to choose a rooted partition of each part in a strict rooted partition of n.at n=20A301751
• Number of positive special sums of integer partitions of n.at n=27A301854
• a(n) = Sum_{k=0..n} sigma(k^2 + 1), where sigma(k) is the sum of divisors of k (A000203).at n=39A333172