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A188840

Number of n X 6 binary arrays without the pattern 0 1 diagonally or vertically.

64, 377, 1093, 2380, 4488, 7752, 12597, 19551, 29260, 42504, 60214, 83490, 113620, 152100, 200655, 261261, 336168, 427924, 539400, 673816, 834768, 1026256, 1252713, 1519035, 1830612, 2193360, 2613754, 3098862, 3656380, 4294668, 5022787, 5850537

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

COMMENTS

Column 6 of A188843.

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..200

FORMULA

Empirical: a(n) = (1/720)*n^6 + (17/240)*n^5 + (203/144)*n^4 + (647/48)*n^3 + (2659/45)*n^2 + (1379/20)*n - 143 for n>3.

Empirical g.f.: x*(64 - 71*x - 202*x^2 + 406*x^3 - 174*x^4 - 88*x^5 + 67*x^6 + 6*x^7 - 6*x^8 - x^9) / (1 - x)^7. - Colin Barker, Apr 30 2018

EXAMPLE

Some solutions for 3 X 6:

..1..1..1..1..1..1....1..1..1..1..1..1....0..0..0..1..1..0....1..1..1..1..1..1

..1..1..1..1..1..1....0..0..1..1..1..1....0..0..0..0..1..0....1..1..1..1..0..0

..0..0..1..1..0..1....0..0..0..1..1..0....0..0..0..0..0..0....1..1..0..1..0..0

CROSSREFS

Cf. A188843.

Sequence in context: A344302 A105918 A224042 * A188703 A297343 A228759

Adjacent sequences: A188837 A188838 A188839 * A188841 A188842 A188843

KEYWORD

nonn

AUTHOR

R. H. Hardin, Apr 12 2011

STATUS

approved

URL: https://oeis.org/A188840

⇱ A188840 - OEIS