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A184022 1/8 the number of (n+1)X3 0..3 arrays with all 2X2 subblock sums the same 1
88, 204, 491, 1347, 3781, 11541, 35771, 117321, 389053, 1343649, 4678331, 16789497, 60610141, 223849641, 830159051, 3132039921, 11849473693, 45412071969, 174350721371, 675875378697, 2623000758301, 10253216100441, 40107029625131 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A184029

LINKS

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

FORMULA

Empirical: a(n)=8*a(n-1)+16*a(n-2)-268*a(n-3)+189*a(n-4)+3388*a(n-5)-5824*a(n-6)-20048*a(n-7)+49756*a(n-8)+52752*a(n-9)-196896*a(n-10)-24192*a(n-11)+369216*a(n-12)-131328*a(n-13)-262656*a(n-14)+165888*a(n-15)

EXAMPLE

Some solutions for 4X3

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

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

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

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

CROSSREFS

Sequence in context: A044801 A342451 A062036 * A116448 A046330 A304519

Adjacent sequences:  A184019 A184020 A184021 * A184023 A184024 A184025

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 08 2011

STATUS

approved

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Last modified September 24 01:27 EDT 2021. Contains 347617 sequences. (Running on oeis4.)