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A236641 Number of (n+1)X(1+1) 0..2 arrays colored with the maximum plus the upper median plus the lower median minus the minimum of every 2X2 subblock 1
81, 518, 3313, 21276, 136697, 877196, 5629192, 36133600, 231937284, 1488661856, 9554913968, 61329206824, 393645872364, 2526623890096, 16217224600128, 104091133212288, 668113886084144, 4288315710064800, 27524738318704304 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 1 of A236645

LINKS

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

FORMULA

Empirical: a(n) = 80*a(n-3) +700*a(n-4) +2080*a(n-5) +6404*a(n-6) +8232*a(n-7) -23620*a(n-8) -91392*a(n-9) -276256*a(n-10) -395520*a(n-11) +444720*a(n-12) +1555840*a(n-13) +3134080*a(n-14) +3744128*a(n-15) -6767872*a(n-16) -13191168*a(n-17) -134144*a(n-18) +1472512*a(n-19) +3850240*a(n-20) +15204352*a(n-21) +1310720*a(n-22) -6815744*a(n-23)

EXAMPLE

Some solutions for n=5

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

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

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

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

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

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

CROSSREFS

Sequence in context: A253662 A253731 A236658 * A253307 A235784 A235565

Adjacent sequences:  A236638 A236639 A236640 * A236642 A236643 A236644

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 29 2014

STATUS

approved

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Last modified August 12 07:45 EDT 2022. Contains 356067 sequences. (Running on oeis4.)