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A213992 Number of 3X3 0..n matrices whose square is also a 0..n matrix 1
172, 1003, 2546, 8168, 14030, 28328, 40370, 64679, 102377, 151301, 191708, 290679, 356931, 445149, 569583, 787170, 917169, 1190970, 1375176, 1744554, 2061684, 2413461, 2647641, 3323763, 3962721, 4502277, 5124586, 6087406, 6704266, 7973326 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 3 of A213990

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

EXAMPLE

Some solutions for n=3

..0..0..2....1..2..1....0..3..0....0..2..1....0..1..3....1..1..0....0..1..0

..0..1..1....0..0..0....0..1..1....0..0..0....0..0..1....0..0..3....0..1..0

..0..1..1....1..0..0....0..2..0....0..0..1....0..0..0....0..0..0....0..1..1

CROSSREFS

Sequence in context: A202641 A234998 A234992 * A214115 A250968 A264213

Adjacent sequences:  A213989 A213990 A213991 * A213993 A213994 A213995

KEYWORD

nonn

AUTHOR

R. H. Hardin Jun 30 2012

STATUS

approved

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Last modified May 21 00:36 EDT 2022. Contains 353886 sequences. (Running on oeis4.)