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A236658 Number of (n+1)X(1+1) 0..2 arrays colored with the maximum plus the upper median plus the lower median of every 2X2 subblock 1
81, 518, 3300, 21372, 138364, 891832, 5750552, 37123784, 239612080, 1546031840, 9976218688, 64380915200, 415463316768, 2680986516336, 17300668796832, 111644039268528, 720453032600368, 4649158495388496, 30001572938739392 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 1 of A236663
LINKS
FORMULA
Empirical: a(n) = 86*a(n-3) +693*a(n-4) +2090*a(n-5) +6696*a(n-6) +7704*a(n-7) -24436*a(n-8) -96408*a(n-9) -299268*a(n-10) -335040*a(n-11) +729732*a(n-12) +2128728*a(n-13) +3765488*a(n-14) +1789376*a(n-15) -13301760*a(n-16) -16992768*a(n-17) +7848704*a(n-18) +15690752*a(n-19) +10651648*a(n-20) +9836544*a(n-21) -9748480*a(n-22) -12713984*a(n-23)
EXAMPLE
Some solutions for n=5
..1..2....0..0....0..2....0..2....1..2....0..1....0..0....1..0....2..0....1..0
..2..0....2..1....1..2....2..2....1..1....1..0....0..2....0..0....0..1....0..0
..1..0....0..1....2..2....0..1....2..2....0..0....2..1....2..0....2..2....1..2
..0..1....2..0....0..0....0..2....1..2....2..1....1..1....1..1....1..2....2..1
..0..2....2..0....1..0....1..1....1..0....2..0....1..0....1..0....1..0....2..2
..2..0....0..0....1..1....1..0....1..1....0..0....2..1....1..0....0..0....0..1
CROSSREFS
Sequence in context: A253314 A253662 A253731 * A236641 A253307 A235784
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 29 2014
STATUS
approved

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Last modified April 23 00:41 EDT 2024. Contains 371906 sequences. (Running on oeis4.)