27543

Appears in sequences

• Number of 5-ary rooted trees with n nodes and height exactly 9.at n=16A036640
• The number of symmetric positive definite 2 X 2 matrices whose entries are integers of absolute value at most n.at n=30A219693
• Number of triangular regions in an equilateral triangular "frame" of size n (see Comments in A328526 for definition).at n=17A333032
• Expansion of e.g.f. 1/(1 - 3*sin(x)).at n=5A352638