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A184370 1/3 the number of (n+1)X4 0..2 arrays with every 2X2 subblock having at least two equal elements connected horizontally or vertically 1
1107, 49235, 2167173, 95528423, 4210059673, 185547841629, 8177524177277, 360402692568245, 15883791500540967, 700035935394350709, 30852225032929689819, 1359729896274471875219, 59926484677950059719491 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A184376

LINKS

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

FORMULA

Empirical: a(n)=38*a(n-1)+302*a(n-2)-1368*a(n-3)-6770*a(n-4)+12666*a(n-5)-575*a(n-6)-5790*a(n-7)+828*a(n-8)+648*a(n-9)

EXAMPLE

Some solutions for 3X4 with a(1,1)=0

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

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

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

CROSSREFS

Sequence in context: A157376 A185501 A322535 * A172638 A278633 A278413

Adjacent sequences:  A184367 A184368 A184369 * A184371 A184372 A184373

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 12 2011

STATUS

approved

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Last modified October 4 18:32 EDT 2022. Contains 357239 sequences. (Running on oeis4.)