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A186012 1/8192 the number of (n+2)X4 0..3 arrays with no 3X3 subblock trace equal to any horizontal or vertical neighbor 3X3 subblock trace 1
1758, 301296, 52270814, 9070779376, 1574001377834, 273130696591960, 47395262542477394, 8224311645479697688, 1427131988463422454506, 247644525687225793261480, 42972767275798088553016770 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A186019

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..200

FORMULA

Empirical: a(n)=114*a(n-1)+10329*a(n-2)+35566*a(n-3)-6225540*a(n-4)+2186532*a(n-5)+1587703872*a(n-6)-9798344360*a(n-7)-147123145218*a(n-8)+1960170443572*a(n-9)-2665967876070*a(n-10)-86187781368644*a(n-11)+624465244317464*a(n-12)-1010255752791240*a(n-13)-8091453661907128*a(n-14)+53540297034829552*a(n-15)-133997096141260565*a(n-16)+70514010784464522*a(n-17)+536313374469172197*a(n-18)-1899389083202463258*a(n-19)+3592775419779955716*a(n-20)-4875253308951845868*a(n-21)+5212414920745336608*a(n-22)-4265797853429976024*a(n-23)+2318744648953982592*a(n-24)-586919240202114720*a(n-25)-86660427663648000*a(n-26)+86061028350528000*a(n-27)-13799439521280000*a(n-28)

EXAMPLE

Some solutions for 6X4

..0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0

..2..0..0..0....2..0..0..0....2..0..0..0....2..0..0..0....2..0..0..0

..1..0..0..2....3..0..0..2....1..0..0..2....1..0..0..2....3..0..0..2

..2..2..0..0....0..0..0..0....3..2..0..0....2..2..0..0....1..0..0..0

..2..3..0..1....2..0..1..1....0..0..0..1....2..0..2..1....0..1..3..1

..3..0..0..2....2..1..1..3....2..0..1..3....2..0..1..2....2..0..1..2

CROSSREFS

Sequence in context: A204280 A252635 A213459 * A031802 A020419 A141287

Adjacent sequences:  A186009 A186010 A186011 * A186013 A186014 A186015

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 10 2011

STATUS

approved

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Last modified October 18 08:08 EDT 2019. Contains 328146 sequences. (Running on oeis4.)