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A184470 1/6 the number of (n+2)X4 0..2 arrays with each 3X3 subblock containing one of one value, four of another, and four of the last 1
1095, 2755, 7085, 19119, 62213, 200215, 645837, 2386807, 8440325, 29121087, 112850957, 413112487, 1461095205, 5765335615, 21394180445, 76423033479, 303819408773, 1133934761455, 4067862256797, 16225029630247, 60710982378005 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 2 of A184477
LINKS
FORMULA
Empirical: a(n)=5*a(n-1)-6*a(n-2)+123*a(n-3)-615*a(n-4)+738*a(n-5)-5552*a(n-6)+27760*a(n-7)-33312*a(n-8)+122328*a(n-9)-611640*a(n-10)+733968*a(n-11)-1443600*a(n-12)+7218000*a(n-13)-8661600*a(n-14)+9366192*a(n-15)-46830960*a(n-16)+56197152*a(n-17)-32980608*a(n-18)+164903040*a(n-19)-197883648*a(n-20)+58413312*a(n-21)-292066560*a(n-22)+350479872*a(n-23)-40310784*a(n-24)+201553920*a(n-25)-241864704*a(n-26)
EXAMPLE
Some solutions with a(1,1)=0 for 6X4
..0..0..0..2....0..1..1..0....0..1..1..0....0..1..0..1....0..0..2..0
..2..2..0..0....1..1..0..0....0..1..2..0....1..0..0..1....2..0..2..1
..2..2..1..2....0..2..0..1....0..1..0..0....1..2..1..0....1..2..0..2
..0..0..0..2....1..0..1..1....0..1..1..0....0..1..0..1....0..0..2..0
..2..2..0..0....1..0..1..0....1..0..2..1....0..1..0..0....2..2..0..1
..2..1..2..2....0..2..0..1....0..1..0..0....1..2..1..0....1..2..0..2
CROSSREFS
Sequence in context: A124122 A163561 A203807 * A234722 A160370 A123366
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 15 2011
STATUS
approved

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Last modified March 28 18:04 EDT 2024. Contains 371254 sequences. (Running on oeis4.)