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A302685 Number of 7Xn 0..1 arrays with every element equal to 0, 1, 4 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. 1
64, 22, 29, 121, 257, 1125, 6311, 25139, 96728, 439233, 1942666, 8017639, 34024545, 148137877, 632641084, 2682460593, 11495724321, 49301780598, 210361660516, 898372105583, 3844885757451, 16440103793864, 70240799575385 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Row 7 of A302680.
LINKS
FORMULA
Empirical: a(n) = a(n-1) +2*a(n-2) +35*a(n-3) +80*a(n-4) +23*a(n-5) -141*a(n-6) -484*a(n-7) -692*a(n-8) +387*a(n-9) -71*a(n-10) +54*a(n-11) +3416*a(n-12) +397*a(n-13) -1793*a(n-14) +2391*a(n-15) -3515*a(n-16) +596*a(n-17) +624*a(n-18) +213*a(n-19) -249*a(n-20) +2769*a(n-21) +540*a(n-22) +1022*a(n-23) +146*a(n-24) -212*a(n-25) -441*a(n-26) -128*a(n-27) +44*a(n-28) +9*a(n-29) -73*a(n-30) -6*a(n-31) for n>38
EXAMPLE
Some solutions for n=5
..0..0..0..1..0. .0..1..1..1..0. .0..1..1..1..0. .0..0..0..1..0
..0..1..0..1..0. .0..1..0..1..0. .0..1..0..1..0. .0..1..0..1..0
..0..1..0..1..0. .0..0..0..1..0. .0..1..0..1..0. .0..1..1..1..0
..0..0..0..1..0. .0..1..0..1..0. .0..1..1..1..0. .0..1..0..1..0
..0..1..0..1..0. .0..1..1..1..0. .0..1..0..1..0. .0..1..0..1..0
..0..1..0..1..0. .0..1..0..1..0. .0..1..0..1..0. .0..1..0..1..0
..0..1..0..0..0. .0..1..0..1..0. .0..1..0..1..0. .0..1..0..1..0
CROSSREFS
Cf. A302680.
Sequence in context: A302894 A303629 A302520 * A281721 A303319 A275469
KEYWORD
nonn
AUTHOR
R. H. Hardin, Apr 11 2018
STATUS
approved

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Last modified July 22 09:18 EDT 2024. Contains 374485 sequences. (Running on oeis4.)