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A207950 Number of 4Xn 0..1 arrays avoiding 0 0 1 and 0 1 1 horizontally and 0 1 0 and 1 0 1 vertically 1
10, 100, 370, 1369, 3478, 8836, 18330, 38025, 69420, 126736, 211820, 354025, 554540, 868624, 1294548, 1929321, 2764110, 3960100, 5494390, 7623121, 10298530, 13912900, 18377710, 24275329, 31453968, 40755456, 51933840, 66178225, 83107160 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 4 of A207949

LINKS

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

FORMULA

Empirical: a(n) = 2*a(n-1) +6*a(n-2) -14*a(n-3) -14*a(n-4) +42*a(n-5) +14*a(n-6) -70*a(n-7) +70*a(n-9) -14*a(n-10) -42*a(n-11) +14*a(n-12) +14*a(n-13) -6*a(n-14) -2*a(n-15) +a(n-16)

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Sequence in context: A207919 A208699 A207255 * A207859 A207809 A208283

Adjacent sequences:  A207947 A207948 A207949 * A207951 A207952 A207953

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 21 2012

STATUS

approved

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Last modified October 25 10:46 EDT 2021. Contains 348239 sequences. (Running on oeis4.)