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A210169 Number of (n+1)X4 0..3 arrays containing all values 0..3 with every 2X2 subblock having two or four distinct values, and new values 0..3 introduced in row major order 1
101, 3283, 89293, 2266901, 55406625, 1323907951, 31194685583, 728618654983, 16924786006687, 391770747425385, 9048653573565509, 208704389188320759, 4809477953050228735, 110770487003358715391, 2550345502157173838959 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A210174

LINKS

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

FORMULA

Empirical: a(n) = 63*a(n-1) -1431*a(n-2) +12729*a(n-3) +3336*a(n-4) -726316*a(n-5) +2597781*a(n-6) +14573977*a(n-7) -80969613*a(n-8) -143169465*a(n-9) +1105985892*a(n-10) +755457488*a(n-11) -8134284268*a(n-12) -2199693420*a(n-13) +33945204080*a(n-14) +3581733232*a(n-15) -80566448928*a(n-16) -3198195264*a(n-17) +104642408704*a(n-18) +1573518080*a(n-19) -66575366656*a(n-20) -375523328*a(n-21) +15376932864*a(n-22) -161906688*a(n-23) -629932032*a(n-24)

EXAMPLE

Some solutions for n=4

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

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

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

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

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

CROSSREFS

Sequence in context: A290549 A275986 A215119 * A027900 A166218 A167626

Adjacent sequences:  A210166 A210167 A210168 * A210170 A210171 A210172

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 18 2012

STATUS

approved

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Last modified June 26 04:02 EDT 2019. Contains 324368 sequences. (Running on oeis4.)