OFFSET
7,1
COMMENTS
Translations are allowed, but not rotations or reflections.
A polyomino is 'kissing' if there exist two cells that touch only at a corner such that no cell exists touching both edgewise simultaneously.
First thirteen terms calculated by filtering the output of Redelmeier's Algorithm.
LINKS
Alain Goupil, Marie-Eve Pellerin, and Jérôme de Wouters d'Oplinter, Partially Directed Snake Polyominoes, Discrete Applied Mathematics, Volume 236, 2018.
EXAMPLE
The smallest kissing polyomino has area 7; its four rotations determine the first term in the sequence:
OOO
O O
OO
CROSSREFS
KEYWORD
nonn,hard,more
AUTHOR
Johann Peters, Nov 22 2023
EXTENSIONS
a(14)-a(18) from John Mason, Sep 25 2024
STATUS
approved