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A184021 1/8 the number of (n+1)X2 0..3 arrays with all 2X2 subblock sums the same 1
32, 88, 242, 748, 2312, 7684, 25538, 89044, 310472, 1119748, 4038482, 14931868, 55209032, 207984844, 783525698, 2994047524, 11441003912, 44197635508, 170739473522, 665105634988, 2590880108552, 10157230949404, 39820190914658 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 1 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 4X2

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

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

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

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

CROSSREFS

Sequence in context: A256803 A229721 A184029 * A317762 A318341 A318073

Adjacent sequences:  A184018 A184019 A184020 * A184022 A184023 A184024

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 08 2011

STATUS

approved

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Last modified October 25 11:29 EDT 2021. Contains 348251 sequences. (Running on oeis4.)