

A211372


Side length of smallest square containing n L's with short sides 1, 2, ..., n.


2




OFFSET

1,1


COMMENTS

Known upper bounds for the next terms are: a(11) <= 41, a(12) <= 46, a(13) <= 51, a(14) <= 57, a(15) <= 63, a(16) <= 69, a(17) <= 75, a(18) <= 82, a(19) <= 88, a(20) <= 95.  Arkadiusz Wesolowski, Feb 10 2016


LINKS

Table of n, a(n) for n=1..10.
Erich Friedman, L's in Squares


EXAMPLE

Illustration:
.
. a  b b a     b b b b         a b b
. a a b b a a c c c b b b b        a a b b
. b b b b c c c b b a a        b b b b
. b b b b c c c b b a  d d d d    b b b b
. c c c c c c  d d d d  c c c c c c
. c c c c c c  d d d d  c c c c c c
. c c c c c c  d d d d  c c c c c c
. d d d d d d d d c c c
. d d d d d d d d c c c
. d d d d d d d d c c c
. d d d d d d d d   
.
. 2 4 7 11
.


CROSSREFS

Sequence in context: A064690 A138766 A192638 * A054850 A225154 A167805
Adjacent sequences: A211369 A211370 A211371 * A211373 A211374 A211375


KEYWORD

nonn,hard,more


AUTHOR

Arkadiusz Wesolowski, Feb 06 2013


STATUS

approved



