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A220304 Majority value maps: number of n X 2 binary arrays indicating the locations of corresponding elements equal to at least half of their horizontal, vertical and antidiagonal neighbors in a random 0..1 n X 2 array. 1
2, 7, 26, 86, 291, 980, 3309, 11161, 37656, 127036, 428581, 1445887, 4877950, 16456589, 55519107, 187303144, 631899019, 2131818803, 7192053308, 24263615009, 81857431864, 276159968238, 931672620616, 3143156039330, 10603971469191 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A220308.

LINKS

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

FORMULA

Empirical: a(n) = 3*a(n-1) + a(n-2) - a(n-3) + 6*a(n-4) + 3*a(n-6) + 3*a(n-7) - a(n-8) + 3*a(n-9) - a(n-10).

Empirical g.f.: x*(2 + x + 3*x^2 + 3*x^3 + 2*x^4 + 5*x^5 + 2*x^6 + 2*x^7 + x^8 + x^9) / (1 - 3*x - x^2 + x^3 - 6*x^4 - 3*x^6 - 3*x^7 + x^8 - 3*x^9 + x^10). - Colin Barker, Jul 31 2018

EXAMPLE

Some solutions for n=3:

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

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

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

CROSSREFS

Cf. A220308.

Sequence in context: A335179 A091145 A261332 * A300451 A212961 A000697

Adjacent sequences:  A220301 A220302 A220303 * A220305 A220306 A220307

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 10 2012

STATUS

approved

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Last modified November 30 06:28 EST 2021. Contains 349419 sequences. (Running on oeis4.)