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A228801 Number of 6Xn binary arrays with top left element equal to 1 and no two ones adjacent horizontally or nw-se. 1
32, 89, 2892, 22060, 362511, 3835792, 51557716, 607251543, 7672139244, 93420773609, 1159188543069, 14247881349908, 175944344684763, 2167769734896816, 26737779597736284, 329618632980267413 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 6 of A228796

LINKS

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

FORMULA

Empirical: a(n) = a(n-1) +119*a(n-2) +397*a(n-3) -1395*a(n-4) -5213*a(n-5) +8797*a(n-6) +24443*a(n-7) -36756*a(n-8) -45888*a(n-9) +84092*a(n-10) +19388*a(n-11) -83412*a(n-12) +24912*a(n-13) +22741*a(n-14) -12257*a(n-15) -1459*a(n-16) +1607*a(n-17) -49*a(n-18) -71*a(n-19) +3*a(n-20) +a(n-21)

EXAMPLE

Some solutions for n=4

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

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

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

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

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

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

CROSSREFS

Sequence in context: A318341 A318073 A279713 * A220581 A297730 A124804

Adjacent sequences:  A228798 A228799 A228800 * A228802 A228803 A228804

KEYWORD

nonn

AUTHOR

R. H. Hardin Sep 04 2013

STATUS

approved

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Last modified October 20 22:44 EDT 2019. Contains 328291 sequences. (Running on oeis4.)