OFFSET
3,2
COMMENTS
This sequence grows as O(n^2), and the constant is known to be between 3/49 and 1. -Zachary DeStefano, Jun 05 2021
LINKS
Zachary DeStefano and Michael Gottlieb, Sokoban Max Moves Archive
Erich Friedman, Problem of the month March 2000
Wikipedia, Sokoban
EXAMPLE
From Zachary DeStefano, Jun 05 2021: (Start)
In standard Sokoban notation, for n = 12 the a(12) = 25 board is:
#####
#@ ###
# # $ #
# .#
#######
(End)
CROSSREFS
KEYWORD
nonn,more,hard
AUTHOR
Kausthub Gudipati, Sep 22 2011
EXTENSIONS
a(14)-a(29) from Zachary DeStefano, Jun 05 2021
STATUS
approved