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A223684
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Number of 6Xn 0..1 arrays with rows and antidiagonals unimodal
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1
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64, 4096, 83737, 744272, 4106403, 17068664, 58944337, 178002044, 484800960, 1215412314, 2845433373, 6286999243, 13216899344, 26605753969, 51547601046, 96528061541, 175319673499, 309757515173, 533729732564, 898819275234
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OFFSET
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1,1
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COMMENTS
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LINKS
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FORMULA
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Empirical: a(n) = (271/5443200)*n^12 + (2327/3326400)*n^11 + (44081/1360800)*n^10 + (67031/362880)*n^9 + (1007557/226800)*n^8 + (1582/675)*n^7 + (211210703/1360800)*n^6 - (60265871/120960)*n^5 + (11265884461/5443200)*n^4 - (118533836/14175)*n^3 + (2826245099/151200)*n^2 - (113088191/3960)*n + 23503 for n>3
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EXAMPLE
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Some solutions for n=3
..1..1..0....1..0..0....0..0..1....1..0..0....1..1..0....0..0..1....1..1..1
..0..1..1....0..1..0....1..0..0....1..1..1....0..0..1....0..1..0....0..1..1
..1..1..0....0..1..1....0..1..1....1..1..1....0..1..0....1..1..1....1..1..1
..0..0..1....1..1..0....1..0..0....0..0..0....0..0..1....0..1..1....0..1..1
..0..1..1....1..1..0....0..1..1....0..1..0....0..1..0....0..0..0....0..1..1
..0..1..1....1..1..0....1..0..0....1..1..0....0..0..0....0..1..0....0..0..0
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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