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A237212 Number of (n+1)X(1+1) 0..3 arrays with the maximum plus the upper median minus the lower median minus the minimum of every 2X2 subblock equal 1
256, 1076, 4770, 22420, 107092, 523218, 2580120, 12870804, 64634026, 326922108, 1661903764, 8491149474, 43548443400, 224187558716, 1157390767538, 5992234819668, 31088874374020, 161649774718450, 841795869921768 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 1 of A237218

LINKS

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

FORMULA

Empirical: a(n) = 14*a(n-1) +9*a(n-2) -935*a(n-3) +2584*a(n-4) +23459*a(n-5) -105654*a(n-6) -285952*a(n-7) +1921192*a(n-8) +1588348*a(n-9) -20149416*a(n-10) +685072*a(n-11) +132759648*a(n-12) -66518688*a(n-13) -567564352*a(n-14) +438496896*a(n-15) +1584509184*a(n-16) -1476106752*a(n-17) -2857446400*a(n-18) +2915932160*a(n-19) +3232051200*a(n-20) -3441262592*a(n-21) -2161868800*a(n-22) +2339045376*a(n-23) +759037952*a(n-24) -824180736*a(n-25) -103809024*a(n-26) +113246208*a(n-27)

EXAMPLE

Some solutions for n=5

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

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

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

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

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

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

CROSSREFS

Sequence in context: A236904 A206198 A237218 * A237694 A237688 A237299

Adjacent sequences:  A237209 A237210 A237211 * A237213 A237214 A237215

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 05 2014

STATUS

approved

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Last modified May 19 13:24 EDT 2022. Contains 353833 sequences. (Running on oeis4.)