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A231421 Number of (2+1)X(n+1) 0..2 arrays with no element equal to a strict majority of its horizontal, diagonal and antidiagonal neighbors, with values 0..2 introduced in row major order 1
50, 1032, 20896, 424404, 8704406, 178277756, 3654045516, 74894704740, 1535161355750, 31467342399888, 645012980337444, 13221399981059518, 271010854744794084, 5555152819316036170, 113868962991822419034 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 2 of A231419

LINKS

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

FORMULA

Empirical: a(n) = 20*a(n-1) +56*a(n-2) -821*a(n-3) -2559*a(n-4) +2274*a(n-5) +11333*a(n-6) +75045*a(n-7) +58970*a(n-8) -744820*a(n-9) -338743*a(n-10) +3350990*a(n-11) -566226*a(n-12) -8533262*a(n-13) +6626396*a(n-14) +10836980*a(n-15) -13238580*a(n-16) -6337152*a(n-17) +13746128*a(n-18) -1255112*a(n-19) -8079152*a(n-20) +2081168*a(n-21) +460736*a(n-22) -1034208*a(n-23) +221216*a(n-24) -114304*a(n-25) -122880*a(n-26) -16384*a(n-27) -512*a(n-28)

EXAMPLE

Some solutions for n=3

..0..1..2..1....0..1..0..1....0..1..1..2....0..1..2..1....0..1..0..2

..1..0..0..1....1..0..2..0....1..2..2..0....1..0..2..1....0..0..2..0

..1..2..1..1....0..2..2..0....0..2..2..1....1..0..2..0....1..2..2..0

CROSSREFS

Sequence in context: A224276 A224199 A112890 * A200207 A160152 A318760

Adjacent sequences:  A231418 A231419 A231420 * A231422 A231423 A231424

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 08 2013

STATUS

approved

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Last modified January 23 17:09 EST 2022. Contains 350514 sequences. (Running on oeis4.)