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A236869 Number of (n+1)X(2+1) 0..2 arrays with the maximum plus the upper median minus the lower median of every 2X2 subblock equal 1
287, 1503, 8117, 46023, 260957, 1502355, 8629071, 49869905, 287699673, 1664594799, 9620992479, 55692720253, 322213277593, 1865831191989, 10802023011287, 62571905494881, 362440288046191, 2100199051687835 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A236875

LINKS

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

FORMULA

Empirical: a(n) = 18*a(n-1) -53*a(n-2) -861*a(n-3) +5994*a(n-4) +8378*a(n-5) -171443*a(n-6) +217564*a(n-7) +2248566*a(n-8) -6318196*a(n-9) -14387480*a(n-10) +70781836*a(n-11) +27546487*a(n-12) -442719094*a(n-13) +222432397*a(n-14) +1682236000*a(n-15) -1852244993*a(n-16) -3906324240*a(n-17) +6571952825*a(n-18) +5149052575*a(n-19) -13516632533*a(n-20) -2596394214*a(n-21) +17089934474*a(n-22) -2269172690*a(n-23) -13345269664*a(n-24) +4414344468*a(n-25) +6340102352*a(n-26) -2938960424*a(n-27) -1781618752*a(n-28) +1013753840*a(n-29) +278602304*a(n-30) -190307328*a(n-31) -20951424*a(n-32) +18611712*a(n-33) +456704*a(n-34) -837632*a(n-35) +10240*a(n-36) +12288*a(n-37)

EXAMPLE

Some solutions for n=4

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

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

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

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

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

CROSSREFS

Sequence in context: A063362 A159949 A158252 * A158287 A112245 A289339

Adjacent sequences:  A236866 A236867 A236868 * A236870 A236871 A236872

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 01 2014

STATUS

approved

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Last modified May 28 04:02 EDT 2022. Contains 354112 sequences. (Running on oeis4.)