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A223635 Number of nX6 0..1 arrays with rows, antidiagonals and columns unimodal 1
22, 484, 5699, 42109, 230619, 1026377, 3907140, 13135511, 39889555, 111242770, 288488044, 702553878, 1619299148, 3555008655, 7473337157, 15110365462, 29495673113, 55765989646, 102405932407, 183099750019, 319441371676 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 6 of A223637
LINKS
FORMULA
Empirical: a(n) = (271/5443200)*n^12 - (10327/9979200)*n^11 + (61997/2177280)*n^10 - (21923/80640)*n^9 + (417761/1814400)*n^8 + (37222841/604800)*n^7 - (2521405483/2177280)*n^6 + (8668581613/725760)*n^5 - (414044081579/5443200)*n^4 + (88564150211/302400)*n^3 - (17419930607/30240)*n^2 + (542846047/3080)*n + 850576 for n>8
EXAMPLE
Some solutions for n=4
..0..1..1..1..0..0....1..1..1..0..0..0....1..1..1..0..0..0....0..0..0..0..1..1
..0..1..1..1..1..0....1..1..1..0..0..0....0..0..1..1..1..1....0..1..1..1..1..0
..0..1..1..1..0..0....0..1..1..1..0..0....0..0..1..1..1..1....0..1..1..1..1..0
..1..1..1..1..0..0....0..0..1..1..0..0....0..0..0..0..0..1....0..0..1..1..0..0
CROSSREFS
Sequence in context: A207744 A207721 A223737 * A223720 A223667 A223826
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 24 2013
STATUS
approved

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Last modified April 16 20:39 EDT 2024. Contains 371754 sequences. (Running on oeis4.)