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A198206 Number of 2nX4 0..3 arrays with values 0..3 introduced in row major order and each element unequal to exactly two horizontal and vertical neighbors 1
43, 1765, 50729, 1660672, 56315642, 1930887802, 66941645630, 2331298473193, 81407459944121, 2846734759084627, 99622031525717855, 3487698946608204322, 122128077706715335280, 4277023178407978272400, 149793878862653254021508 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A198209

LINKS

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

FORMULA

Empirical: a(n) = 65*a(n-1) -1221*a(n-2) +4909*a(n-3) +38995*a(n-4) +97941*a(n-5) -5336901*a(n-6) +24513309*a(n-7) -24792291*a(n-8) +22615443*a(n-9) +29343465*a(n-10) -1299185649*a(n-11) +509455089*a(n-12) +6460607223*a(n-13) -508707135*a(n-14) -5208653241*a(n-15)

EXAMPLE

Some solutions for n=3

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

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

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

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

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

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

CROSSREFS

Sequence in context: A235646 A022220 A297028 * A162881 A163226 A163745

Adjacent sequences:  A198203 A198204 A198205 * A198207 A198208 A198209

KEYWORD

nonn

AUTHOR

R. H. Hardin Oct 22 2011

STATUS

approved

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Last modified January 27 03:09 EST 2022. Contains 350601 sequences. (Running on oeis4.)