68352

Appears in sequences

• E.g.f. log(1 + tanh(sinh(x))).at n=12A009385
• Expansion of tan(sin(x))*cos(x).at n=5A009662
• arcsinh(arcsin(tan(x)))=x+2/3!*x^3+24/5!*x^5+888/7!*x^7+68352/9!*x^9...at n=4A012081
• Numbers k such that (k, sigma(k)) lies on a circle with integral radius centered at the origin, i.e., k^2 + sigma(k)^2 is a square.at n=32A066764
• Triangle read by rows: T(n,k) is the number of ordered trees having n edges and k branches of length 2.at n=43A101307
• Number of ways to place 4 nonattacking amazons (superqueens) on a 4 X n board.at n=22A174642
• Number of ordered triples (w,x,y) with all terms in {-n,...-1,1,...,n} and 2w+x+y>1.at n=26A211618
• 3 X 3 X 3 triangular graph coloring a rectangular array: number of n X 1 0..5 arrays where 0..5 label nodes of a graph with edges 0,1 0,2 1,2 1,3 1,4 2,4 3,4 2,5 4,5 and every array movement to a horizontal or vertical neighbor moves along an edge of this graph.at n=8A223211
• G.f. satisfies A(x) = 1 + x / (1 + x*A(x))^3.at n=12A365110