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A236813 Number of (n+1)X(2+1) 0..2 arrays with the maximum plus the lower median minus the minimum of every 2X2 subblock equal 1
303, 1791, 10702, 66853, 419301, 2680296, 17221539, 111813697, 729282012, 4786748055, 31528549737, 208503506840, 1382369251257, 9189156815701, 61193561041026, 408217953424503, 2726599132619631, 18232898224831510 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A236819

LINKS

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

FORMULA

Empirical: a(n) = 21*a(n-1) -100*a(n-2) -822*a(n-3) +9025*a(n-4) -6166*a(n-5) -227164*a(n-6) +761691*a(n-7) +2056841*a(n-8) -14904183*a(n-9) +4818303*a(n-10) +131300778*a(n-11) -239600971*a(n-12) -518603618*a(n-13) +1978489660*a(n-14) +49780225*a(n-15) -7775913759*a(n-16) +7725412959*a(n-17) +14487841224*a(n-18) -31018825865*a(n-19) -3698011866*a(n-20) +55220616016*a(n-21) -33860955124*a(n-22) -43168404248*a(n-23) +59680526360*a(n-24) +1187247872*a(n-25) -39820734688*a(n-26) +18284518864*a(n-27) +8552972960*a(n-28) -9006433472*a(n-29) +1006397632*a(n-30) +1171967872*a(n-31) -352288384*a(n-32) -23834624*a(n-33) +14026752*a(n-34)

EXAMPLE

Some solutions for n=4

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

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

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

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

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

CROSSREFS

Sequence in context: A252598 A252597 A237093 * A332130 A291132 A328277

Adjacent sequences:  A236810 A236811 A236812 * A236814 A236815 A236816

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 31 2014

STATUS

approved

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Last modified June 21 06:55 EDT 2021. Contains 345358 sequences. (Running on oeis4.)