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A184451 1/36 the number of (n+2)X5 0..2 arrays with each 3X3 subblock containing two of one value, two of another, and five of the last 1
864, 1591, 3125, 6880, 20706, 67180, 232326, 967138, 4023354, 16410550, 76004286, 342234442, 1471593474, 7091681506, 32977550190, 145061691070, 712044245886, 3363409747810, 14962231319346, 74119694182018, 352903456485534 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 3 of A184457
LINKS
FORMULA
Empirical: a(n)=6*a(n-1)-11*a(n-2)+195*a(n-3)-1134*a(n-4)+2079*a(n-5)-11600*a(n-6)+62796*a(n-7)-115126*a(n-8)+263520*a(n-9)-1204344*a(n-10)+2207964*a(n-11)-2907648*a(n-12)+10219824*a(n-13)-18736344*a(n-14)+17243280*a(n-15)-42140736*a(n-16)+77258016*a(n-17)-55857600*a(n-18)+82301184*a(n-19)-150885504*a(n-20)+92378880*a(n-21)-60466176*a(n-22)+110854656*a(n-23)-60466176*a(n-24)
EXAMPLE
Some solutions with a(1,1)=0 for 4X5
..0..0..1..0..2....0..0..0..0..1....0..2..1..0..2....0..2..0..1..1
..0..2..2..0..1....2..1..2..0..0....1..1..1..1..1....1..0..0..0..2
..0..1..0..0..0....0..1..0..2..1....1..2..0..1..2....2..1..0..2..0
..0..0..1..0..2....0..0..0..0..1....1..0..2..1..0....0..2..0..1..1
CROSSREFS
Sequence in context: A252298 A252305 A252306 * A203662 A179671 A297914
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 14 2011
STATUS
approved

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Last modified February 23 14:24 EST 2024. Contains 370283 sequences. (Running on oeis4.)