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A237169 Number of (n+1)X(1+1) 0..3 arrays with the maximum minus the lower median of every 2X2 subblock equal 1
256, 1696, 11242, 79688, 571176, 4149488, 30302376, 222236840, 1634080758, 12040114696, 88854942464, 656646761776, 4858559900656, 35988568287312, 266850660194506, 1980583052699752, 14713536840656472, 109401041742567216 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 1 of A237175

LINKS

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

FORMULA

Empirical: a(n) = 13*a(n-1) +41*a(n-2) -991*a(n-3) -233*a(n-4) +33503*a(n-5) -14430*a(n-6) -661128*a(n-7) +333383*a(n-8) +8416693*a(n-9) -2868153*a(n-10) -71956485*a(n-11) +5469267*a(n-12) +415886671*a(n-13) +92637374*a(n-14) -1590963716*a(n-15) -830241568*a(n-16) +3809932736*a(n-17) +3099961760*a(n-18) -5076149312*a(n-19) -5749892352*a(n-20) +2817108224*a(n-21) +4878532608*a(n-22) -21157888*a(n-23) -1661034496*a(n-24) -337674240*a(n-25) +167116800*a(n-26) +47185920*a(n-27)

EXAMPLE

Some solutions for n=4

..1..1....2..1....3..2....1..2....3..0....1..1....2..3....3..1....0..2....3..1

..2..0....3..3....1..2....2..1....1..1....1..2....2..1....1..2....1..3....2..2

..2..1....0..2....3..2....2..0....3..1....3..3....0..1....1..3....1..3....0..3

..2..3....3..2....1..2....2..1....1..3....2..1....1..2....2..1....2..1....3..2

..1..3....0..2....2..1....2..3....3..0....2..1....3..3....1..3....3..0....0..2

CROSSREFS

Sequence in context: A237538 A237532 A237175 * A237936 A237931 A237494

Adjacent sequences:  A237166 A237167 A237168 * A237170 A237171 A237172

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 04 2014

STATUS

approved

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Last modified August 19 18:30 EDT 2022. Contains 356229 sequences. (Running on oeis4.)