Expand description
Returns how many nodes are in the tree that the node spans.
Examples
assert_eq!(flat_tree::count(0), 1);
assert_eq!(flat_tree::count(1), 3);
assert_eq!(flat_tree::count(3), 7);
assert_eq!(flat_tree::count(5), 3);
assert_eq!(flat_tree::count(23), 15);
assert_eq!(flat_tree::count(27), 7);