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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

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

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

Adjacent sequences:  A237919 A237920 A237921 * A237923 A237924 A237925

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 15 2014

STATUS

approved

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Last modified October 5 03:25 EDT 2022. Contains 357240 sequences. (Running on oeis4.)