A237986 - OEIS

The OEIS is supported by the many generous donors to the OEIS Foundation.

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

Other ways to Give

A237986

Area of smallest square containing n L's with short side lengths 1, 2, ..., n.

0, 4, 16, 49, 121, 196, 324, 484, 676, 961, 1296, 1681, 2116, 2704, 3364, 3969, 4761, 5625, 6724

(list; graph; refs; listen; history; text; internal format)

OFFSET

0,2

LINKS

Table of n, a(n) for n=0..18.

Erich Friedman, L's in Squares

FORMULA

a(n) = A211372(n)^2

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

. d d d d d d d d c c c

. d d d d d d d d - - -

. 4 16 49 121

CROSSREFS

Sequence in context: A222936 A370019 A119005 * A086601 A224147 A227266

Adjacent sequences: A237983 A237984 A237985 * A237987 A237988 A237989

KEYWORD

nonn,hard,more

AUTHOR

Ivan Panchenko, Feb 16 2014

STATUS

approved