55248

Appears in sequences

• Number of weakly connected oriented graphs on n labeled nodes.at n=4A054941
• Surround numbers of an n X 1 rectangle.at n=16A060633
• Integers n > 1 such that A130280(4n^2) < n, i.e., there is an m < n, m > 1 such that 4n^2(m^2 - 1) + 1 is a square.at n=27A130281
• Square array A(n,k), n >= 1, k >= 1, read by antidiagonals, where column k is the expansion of e.g.f. log(Sum_{j>=0} k^binomial(j,2) * x^j/j!).at n=25A308460