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A226393 Number of nondecreasing -2..2 vectors of length n whose dot product with some nonincreasing -2..2 vector equals n 1
2, 12, 12, 48, 38, 128, 92, 282, 182, 540, 322, 948, 540, 1546, 836, 2394, 1244, 3544, 1790, 5070, 2488, 7036, 3366, 9530, 4478, 12626, 5818, 16428, 7446, 21022, 9402, 26524, 11706, 33032, 14400, 40678, 17564, 49570, 21186, 59854, 25352, 71650, 30116 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A226398

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..45

EXAMPLE

All solutions for n=3

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

..1....1...-1...-1....1...-1...-2....1...-2....2....2...-1

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

CROSSREFS

Sequence in context: A168457 A045895 A251421 * A198532 A198477 A075178

Adjacent sequences:  A226390 A226391 A226392 * A226394 A226395 A226396

KEYWORD

nonn

AUTHOR

R. H. Hardin Jun 06 2013

STATUS

approved

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Last modified May 29 03:06 EDT 2020. Contains 334696 sequences. (Running on oeis4.)