131812

Appears in sequences

• Denominators of average numbers of trees in a forest on n nodes.at n=22A095132
• Number of 4-step one or two space at a time bishop's tours on an n X n board summed over all starting positions.at n=21A187048
• Number of -n..n arrays x(0..3) of 4 elements with zero sum and no two neighbors equal.at n=28A199706