Matches in DBpedia 2014 for { ?s ?p This seems to be an error, the number of plane trees with ten vertices and the number of handshakes should both be the ninth Catalan number. OEIS http://oeis.org/A000108 for the Catalan numbers has both of these ideas listed, "Ways of joining 2n points on a circle to form n nonintersecting chords." so 18 points is ninth Catalan # and "a is the number of ordered rooted trees with n nodes, not including the root." so again, 10 roots is Catalan . And this number is 4862, not 280.. }
Showing items 1 to 1 of
1
with 100 items per page.
- 280_(number) reason "This seems to be an error, the number of plane trees with ten vertices and the number of handshakes should both be the ninth Catalan number. OEIS http://oeis.org/A000108 for the Catalan numbers has both of these ideas listed, "Ways of joining 2n points on a circle to form n nonintersecting chords." so 18 points is ninth Catalan # and "a is the number of ordered rooted trees with n nodes, not including the root." so again, 10 roots is Catalan . And this number is 4862, not 280.".