41955

Appears in sequences

• Number of positive integers <= 2^n of form 6*x^2 + 7*y^2.at n=19A054182
• a(n) = floor(3^n/(3n-1)).at n=12A191627
• Coefficient of x in the reduction by x^2 -> x+1 of the polynomial p(n,x) defined at Comments.at n=18A192970
• Triangle read by rows: T(n,m) (n>=0, 1 <= m <= n+1) = number of unlabeled rigid interval posets with n non-maximal and m maximal elements.at n=31A193344
• Triangle read by rows: T(n,k) is the number of length-n ascent sequences without flat steps, containing k zeros.at n=70A218757
• G.f.: A(x,y) = Sum_{n=-oo..+oo} (x*y)^(n*(n+1)/2) * C(x)^(2*n-1), where C(x) = 1 + x*C(x)^2 is the g.f. of the Catalan numbers (A000108).at n=81A355346