223782

Appears in sequences

• G.f. satisfies: A(A(x)) = (1+x)^2*A(x).at n=8A107095
• The number of edges on a 2 by 1 ellipse formed by the straight line segments mutually connecting all points formed by dividing the ellipse into 2n equal angle sectors from its origin.at n=20A341764
• Sum of the prime numbers in, but not on the border of, an n X n square array whose elements are the numbers from 1..n^2, listed in increasing order by rows.at n=42A344847