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A236635 Number of (n+1)X(1+1) 0..2 arrays colored with the maximum plus the upper median plus the minimum of every 2X2 subblock 1
81, 474, 2796, 16588, 98368, 582304, 3448740, 20433016, 121047396, 716976816, 4246991476, 25158285744, 149029929508, 882785392368, 5229257584788, 30976260240096, 183491943495380, 1086934090832432, 6438575430083476 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 1 of A236640

LINKS

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

FORMULA

Empirical: a(n) = 50*a(n-3) +505*a(n-4) +1446*a(n-5) +4968*a(n-6) +9904*a(n-7) +2968*a(n-8) -14344*a(n-9) -107140*a(n-10) -262208*a(n-11) -282860*a(n-12) -257912*a(n-13) +344240*a(n-14) +1446208*a(n-15) +1594752*a(n-16) +1353472*a(n-17) +397312*a(n-18) -1295360*a(n-19) -1280000*a(n-20) -319488*a(n-21)

EXAMPLE

Some solutions for n=5

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

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

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

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

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

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

CROSSREFS

Sequence in context: A236640 A236780 A237678 * A236775 A205293 A205286

Adjacent sequences:  A236632 A236633 A236634 * A236636 A236637 A236638

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 29 2014

STATUS

approved

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Last modified May 21 15:32 EDT 2019. Contains 323444 sequences. (Running on oeis4.)