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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

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

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

Adjacent sequences:  A208394 A208395 A208396 * A208398 A208399 A208400

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 25 2012

STATUS

approved

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Last modified January 25 15:34 EST 2022. Contains 350572 sequences. (Running on oeis4.)