154560

Appears in sequences

• Number of "ups" and "downs" in the permutations of [n] if either a previous counted "up" ("down") or a "void" precedes an "up" ("down") which then will be counted also.at n=6A120928
• Integer areas A of integer-sided cyclic quadrilaterals such that the length of the circumradius is a perfect square.at n=17A233315
• Triangle T(n,k): vertex labeled disconnected Goldstone diagrams with n interactions and k external potentials.at n=17A328922
• E.g.f. satisfies A(x) = 1 - x^2*A(x)^2*log(1 - x*A(x)).at n=8A371138
• E.g.f. satisfies A(x) = 1 - x^2*log(1 - x*A(x)^2).at n=8A371233