47568

Appears in sequences

• At stage 1, start with a unit equilateral triangle. At each successive stage add 3*(n-1) new triangles around outside with vertex-to-vertex contacts. Sequence gives number of triangles at n-th stage.at n=48A269064
• Number of pairs (lambda,mu) of partitions lambda of n and mu of six with mu <= lambda (by diagram containment).at n=23A303856
• Expansion of e.g.f. exp(3 * x * cosh(x)).at n=7A352645