28504

Appears in sequences

• Triangle of coefficients of powers of e^2 in numerators of Sum_{k>=1} {1 / (1 + k^2*Pi^2)^n}.at n=24A085470
• Number of intersections inside an equilateral triangular figure formed by the straight line segments mutually connecting all vertices and all points that divide the sides into n equal parts. If three or more lines meet at an interior point this intersection is counted only once.at n=11A092866
• Structured hexagonal diamond numbers (vertex structure 5).at n=27A100178
• Number of non-intersecting unit cubes regularly packed into the tetrahedron of edge length n.at n=63A219965
• The number of digits of (2^n)!.at n=13A244061
• Sum of ceiling(n/per(w)) over all binary words of length n.at n=13A331699
• E.g.f.: exp(Sum_{k>=1} A014197(k)*x^k).at n=6A347524