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A228795 Number of nX7 binary arrays with top left element equal to 1 and no two ones adjacent horizontally or nw-se. 1
13, 240, 5223, 111966, 2404290, 51557716, 1104367784, 23641626212, 505993241296, 10828817788952, 231743779512528, 4959437834349136, 106134373970906624, 2271325959440419296, 48607446692414050880, 1040222244289865070400 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 7 of A228796

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

FORMULA

Empirical: a(n) = 34*a(n-1) -324*a(n-2) +1264*a(n-3) -2236*a(n-4) +1816*a(n-5) -624*a(n-6) +64*a(n-7) for n>10

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Sequence in context: A000824 A229384 A181035 * A271782 A157969 A218229

Adjacent sequences:  A228792 A228793 A228794 * A228796 A228797 A228798

KEYWORD

nonn

AUTHOR

R. H. Hardin Sep 04 2013

STATUS

approved

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Last modified March 18 20:16 EDT 2019. Contains 321293 sequences. (Running on oeis4.)