22072

Appears in sequences

• Trajectory of 1 under map n->21n+1 if n odd, n->n/2 if n even.at n=18A033967
• Trajectory of 3 under map n->21*n+1 if n odd, n->n/2 if n even.at n=25A037108
• Denominators of continued fraction convergents to sqrt(561).at n=13A042075
• E.g.f. satisfies: A(x) = exp( x*sqrt(A(x)/A(-x)) ).at n=7A143599
• a(n) = floor(M(g(n-1)+1,..,g(n))), where M = harmonic mean and g(n) = n*(n + 1)*(n + 2)*(n + 3)/24.at n=25A227018
• 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=29A290447
• Triples (a,b,c) such that (a+b+c)^3 = concat(a,b,c), a, b, c > 0, ordered by size of this value.at n=36A328199
• Square array A(n,k), n >= 0, k >= 0, read by antidiagonals downwards, where column k is the expansion of B(x)^k, where B(x) is the g.f. of A382450.at n=50A384777
• Expansion of 1/(g^2 * (2 - g^2)), where g = 1+x*g^4 is the g.f. of A002293.at n=6A391515