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A221312 Number of idempotent 3X3 -n..n matrices of rank 1 2
87, 447, 999, 1935, 2871, 5079, 6399, 8679, 10971, 14667, 16755, 22323, 24795, 29979, 35643, 41019, 44259, 53139, 56763, 66123, 74043, 82203, 86595, 100035, 106755, 116403, 125091, 138243, 143787, 165627, 171555, 183867, 196347, 208971, 222267 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 3 of A221311

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..42

EXAMPLE

Some solutions for n=3

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

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

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

CROSSREFS

Sequence in context: A219723 A033631 A183724 * A098139 A359341 A297509

Adjacent sequences: A221309 A221310 A221311 * A221313 A221314 A221315

KEYWORD

nonn

AUTHOR

R. H. Hardin Apr 10 2013

STATUS

approved

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Last modified February 4 04:29 EST 2023. Contains 360046 sequences. (Running on oeis4.)