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A230922 Number of nX4 0..2 arrays x(i,j) with each element horizontally, vertically, diagonally or antidiagonally next to at least one element with value (x(i,j)+1) mod 3 and at least one element with value (x(i,j)-1) mod 3, and upper left element zero 1
0, 432, 8748, 559872, 28978992, 1509045552, 79222650048, 4146049651392, 217126339216128, 11369937986534592, 595387976257771200, 31177761046838020800, 1632634490394925956288, 85493509927692733685952 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 4 of A230926

LINKS

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

FORMULA

Empirical: a(n) = 39*a(n-1) +624*a(n-2) +4268*a(n-3) -17754*a(n-4) +128856*a(n-5) -345592*a(n-6) +557424*a(n-7) -939312*a(n-8) -946592*a(n-9) -489504*a(n-10) -318144*a(n-11) -475904*a(n-12) -49152*a(n-13) +15360*a(n-14) +4096*a(n-15)

EXAMPLE

Some solutions for n=3

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

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

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

CROSSREFS

Sequence in context: A236279 A223595 A223436 * A109123 A223688 A269183

Adjacent sequences:  A230919 A230920 A230921 * A230923 A230924 A230925

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 01 2013

STATUS

approved

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Last modified July 17 17:14 EDT 2019. Contains 325107 sequences. (Running on oeis4.)