131453

Appears in sequences

• Number of series-reduced rooted trees with n nodes.at n=22A001679
• Number of homeomorphically irreducible rooted trees (also known as series-reduced rooted trees, or rooted trees without nodes of degree 2) with n >= 1 nodes.at n=22A059123
• 1/8 the number of n X n arrays of squares of integers with every 2X2 subblock summing to 17.at n=15A159217