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A237922 Number of (n+1)X(1+1) 0..3 arrays with the maximum plus the lower median of every 2X2 subblock differing from its horizontal and vertical neighbors by exactly one 1
256, 1632, 10316, 66512, 431640, 2776536, 17920936, 115383848, 745952272, 4801239096, 31023158644, 199699207808, 1290589180896, 8307345571648, 53684274618860, 345562572268528, 2233164262251368, 14374690362585720 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 1 of A237927
LINKS
FORMULA
Empirical: a(n) = 1181*a(n-4) +22032*a(n-6) +73432*a(n-8) -1336476*a(n-10) -12277371*a(n-12) -12126056*a(n-14) +265052455*a(n-16) +1326988676*a(n-18) +2166031440*a(n-20) -838485120*a(n-22) -6967321344*a(n-24) -7539800064*a(n-26) -1875689472*a(n-28) +700055552*a(n-30)
EXAMPLE
Some solutions for n=4
..1..1....1..2....2..2....3..3....0..0....1..3....1..2....2..0....2..0....0..3
..2..3....1..1....1..0....1..1....0..2....0..3....1..2....2..3....0..0....3..1
..2..1....1..0....2..3....1..2....1..1....0..2....3..0....1..1....3..3....2..2
..1..3....1..2....0..0....1..3....0..3....1..0....2..0....0..2....1..0....1..2
..2..2....2..2....2..2....2..2....1..0....2..2....0..2....2..0....1..2....1..2
CROSSREFS
Sequence in context: A238155 A238148 A237927 * A238072 A238065 A237538
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 15 2014
STATUS
approved

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Last modified April 25 06:49 EDT 2024. Contains 371964 sequences. (Running on oeis4.)