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A213957 Number of n X n 0..3 matrices with row and column i=1..n having sum <= i*3 0
4, 120, 32060, 74323976, 1494988224948, 261421322089741976, 398278555474658144086480, 5298226825488439815883527067288 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A213962

LINKS

Table of n, a(n) for n=1..8.

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Sequence in context: A203033 A001332 A071304 * A006607 A286757 A239187

Adjacent sequences:  A213954 A213955 A213956 * A213958 A213959 A213960

KEYWORD

nonn

AUTHOR

R. H. Hardin Jun 28 2012

STATUS

approved

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Last modified November 20 06:06 EST 2018. Contains 317385 sequences. (Running on oeis4.)