A072772 Y-projection of the tabular N X N -> N bijection A072764 and X-projection of its transpose A072766.

0, 1, 0, 2, 3, 1, 0, 0, 4, 5, 6, 7, 8, 2, 3, 1, 0, 0, 1, 0, 0, 0, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 4, 5, 6, 7, 8, 2, 3, 1, 0, 0, 1, 0, 0, 0, 2, 3, 1, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44

Offset: 1

Author

Antti Karttunen, Jun 12 2002

Keywords

• nonn

Comments

This corresponds to Lisp/Scheme function 'cdr' computed with respect to the lexicographical ordering of parenthesizations/planar binary trees (A014486), i.e. with planar binary trees this is equal to extracting the right subtree (from the root), with general parenthesizations equal to discarding the first sub-parenthesization of the top-level list and with general plane trees equal to discarding the leftmost branch from the root.

Links

• A. Karttunen, Gatomorphisms (with the complete Scheme source)