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A234927 Number of (n+2) X (1+2) 0..2 arrays with each 3 X 3 subblock having the sum of its 72 absolute element differences equal to 34 and no adjacent elements equal. 1
56, 88, 138, 176, 312, 432, 584, 960, 1408, 1872, 3168, 4544, 6080, 10176, 14720, 19648, 33024, 47616, 63616, 106752, 154112, 205824, 345600, 498688, 666112, 1118208, 1613824, 2155520, 3618816, 5222400, 6975488, 11710464, 16900096 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
FORMULA
Empirical: a(n) = 2*a(n-3) + 4*a(n-6) for n>9.
Empirical g.f.: 2*x*(28 + 44*x + 69*x^2 + 32*x^3 + 68*x^4 + 78*x^5 + 4*x^6 - 8*x^7 - 4*x^8) / (1 - 2*x^3 - 4*x^6). - Colin Barker, Oct 16 2018
EXAMPLE
Some solutions for n=5:
..0..2..1....0..1..2....1..2..0....0..1..2....1..2..0....0..2..1....2..0..2
..2..1..2....1..2..1....2..0..1....1..2..0....2..0..2....2..1..2....1..2..1
..1..2..0....2..0..2....0..1..0....2..1..2....1..2..1....1..2..0....2..0..2
..2..0..1....1..2..0....1..0..2....0..2..1....2..0..2....2..0..2....1..2..0
..0..1..0....2..1..2....0..2..1....1..0..2....1..2..0....1..2..1....2..1..2
..1..0..2....0..2..1....2..1..2....0..1..0....2..1..2....2..0..2....1..2..0
..0..2..0....1..0..2....0..2..1....1..0..2....0..2..1....1..2..0....0..1..2
CROSSREFS
Sequence in context: A214250 A286981 A254369 * A104394 A353281 A101935
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 01 2014
STATUS
approved

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Last modified March 4 05:23 EST 2024. Contains 370522 sequences. (Running on oeis4.)