OFFSET
3,2
COMMENTS
This sequence grows exponentially, and the base is known to be somewhere between phi and 2. - Zachary DeStefano, Jun 05 2021
LINKS
Zachary DeStefano and qqwref, 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 = 14 the a(14) = 48 board is:
#####
##@.#
##$ #
# #
# #$###
# *.#
#######
(End)
CROSSREFS
KEYWORD
nonn,more,hard
AUTHOR
Kausthub Gudipati, Sep 22 2011
EXTENSIONS
a(11) corrected and a(15)-a(17) added by Zachary DeStefano, Jun 05 2021
a(18)-a(20) from Zachary DeStefano, Jul 29 2021
STATUS
approved