2561280

Appears in sequences

• Denominator of J(n) = A000356(n)/A000309(n) (average number of 4-colorings of rank 0 in a rooted nonseparable map which is trivalent and has 2n nodes).at n=9A097875
• The row sums of the ED4 array A167584 read by antidiagonals.at n=7A167590