OFFSET
1,8
COMMENTS
A proper subtanglegram of a planar tanglegram is a pair of subtrees whose leaves are matched in the tanglegram, and the irreducible component of a planar tanglegram is formed by contracting each maximal proper subtanglegram into a pair of matched leaves.
LINKS
Alexander E. Black, Kevin Liu, Alex McDonough, Garrett Nelson, Michael C. Wigal, Mei Yin, and Youngho Yoo, Sampling planar tanglegrams and pairs of disjoint triangulations, Advances in Applied Mathematics 149 (2023), Paper No. 102550.
FORMULA
EXAMPLE
Triangle begins
1;
0, 1;
0, 1, 1;
0, 3, 3, 5;
0, 13, 9, 20, 34;
0, 90, 46, 70, 170, 273;
0, 747, 312, 360, 680, 1638, 2436;
0, 7040, 2580, 2435, 3570, 7371, 17052, 23391;
...
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
Kevin Liu, Apr 01 2024
STATUS
approved