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A209964 Number of (n+1)X4 0..3 arrays containing all values 0..3 with every 2X2 subblock having one or two distinct values, and new values 0..3 introduced in row major order 1
9, 665, 25435, 870686, 27112487, 795773818, 22419183624, 613401570788, 16424902481420, 432709421228995, 11258156191933508, 290080208368537797, 7417347951459937609, 188514123487930064371, 4767959508783108762389 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A209969

LINKS

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

FORMULA

Empirical: a(n) = 66*a(n-1) -1487*a(n-2) +11648*a(n-3) +14141*a(n-4) -454021*a(n-5) +667500*a(n-6) +5458068*a(n-7) -11933206*a(n-8) -23623289*a(n-9) +65454499*a(n-10) +26595728*a(n-11) -134617798*a(n-12) +33919512*a(n-13) +79370592*a(n-14) -38830848*a(n-15) -7503360*a(n-16) +6127616*a(n-17) -655360*a(n-18)

EXAMPLE

Some solutions for n=4

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

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

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

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

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

CROSSREFS

Sequence in context: A221133 A015007 A054327 * A287937 A053973 A059492

Adjacent sequences:  A209961 A209962 A209963 * A209965 A209966 A209967

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 16 2012

STATUS

approved

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Last modified October 16 03:24 EDT 2019. Contains 328038 sequences. (Running on oeis4.)