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A208397 Number of 6Xn 0..2 arrays with new values 0..2 introduced in row major order and no element equal to more than two of its immediate leftward or upward or right-upward antidiagonal neighbors 1
122, 88574, 53466192, 33085555344, 20413586117376, 12599441934740388, 7776176148498498768, 4799354153334997638528, 2962097148583259021121408, 1828166808374593843302307296, 1128320137401532221612440868480 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Row 6 of A208392
LINKS
FORMULA
Empirical: a(n) = 483*a(n-1) +79374*a(n-2) +2325758*a(n-3) -116482840*a(n-4) -4495564268*a(n-5) +111405792720*a(n-6) +2919342926960*a(n-7) -84278449377440*a(n-8) -292603254712096*a(n-9) +29279534769068608*a(n-10) -369555641966430528*a(n-11) +1674749264072678656*a(n-12) +2156486801391239424*a(n-13) -44057404748132724736*a(n-14) +72097583624114731008*a(n-15) +455663058958407811072*a(n-16) -1247507020751283224576*a(n-17) -3007043688407624581120*a(n-18) +9354958262137561546752*a(n-19) +16366237761751490756608*a(n-20) -38560165649886912446464*a(n-21) -74672497584369523752960*a(n-22) +72558930328852457586688*a(n-23) +224968833273366480683008*a(n-24) +41691604839132475424768*a(n-25) -285907224003663252946944*a(n-26) -313784969927732142014464*a(n-27) -101581793844321214005248*a(n-28) +27613799564794291814400*a(n-29) +24843347713795943301120*a(n-30) +2744862767351536287744*a(n-31) -1217400666371817209856*a(n-32) -239668061369775685632*a(n-33) for n>37
EXAMPLE
Some solutions for n=4
..0..0..1..0....0..0..0..1....0..1..2..1....0..0..0..0....0..0..1..2
..1..1..0..0....1..2..2..1....2..0..0..1....0..1..1..2....2..2..1..0
..2..0..1..0....2..0..1..1....0..2..0..1....0..1..2..1....0..1..2..1
..0..1..1..0....2..1..2..0....2..0..1..0....2..2..0..0....0..1..0..0
..0..1..0..2....1..2..0..1....0..2..1..1....0..2..2..0....2..2..0..0
..2..2..0..1....1..2..0..2....2..0..0..1....0..1..0..1....0..1..0..2
CROSSREFS
Sequence in context: A208320 A208390 A282274 * A098129 A198603 A237640
KEYWORD
nonn
AUTHOR
R. H. Hardin Feb 25 2012
STATUS
approved

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Last modified March 28 07:20 EDT 2024. Contains 371235 sequences. (Running on oeis4.)