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A185919 Number of (n+1)X2 0..3 arrays with no 2X2 subblock determinant equal to any horizontal or vertical neighbor 2X2 subblock determinant 2
256, 3516, 49342, 687900, 9599032, 133932498, 1868731400, 26074015256, 363805229334, 5076097479776, 70825715574254, 988216243835574, 13788372439454958, 192386247156430148, 2684324655228015934 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 1 of A185923
LINKS
FORMULA
Empirical: a(n)=6*a(n-1)+66*a(n-2)+461*a(n-3)+1836*a(n-4)+5728*a(n-5)+12892*a(n-6)+21504*a(n-7)+23266*a(n-8)+7230*a(n-9)-27944*a(n-10)-63965*a(n-11)-75166*a(n-12)-58649*a(n-13)-25842*a(n-14)+2124*a(n-15)+27222*a(n-16)+67271*a(n-17)+71840*a(n-18)+10072*a(n-19)-39844*a(n-20)-8317*a(n-21)+7710*a(n-22)+7968*a(n-23)+3189*a(n-24)-30*a(n-25)-562*a(n-26)-1092*a(n-27) for n>28
EXAMPLE
Some solutions for 3X2
..0..1....3..2....1..3....0..3....0..1....3..3....0..1....3..1....0..2....1..1
..3..3....1..1....2..1....1..3....0..1....0..1....3..2....3..3....2..1....3..2
..2..2....3..2....2..0....1..2....1..0....2..0....3..0....2..2....3..1....1..3
CROSSREFS
Sequence in context: A185925 A205281 A185923 * A259320 A247931 A186200
KEYWORD
nonn
AUTHOR
R. H. Hardin Feb 06 2011
STATUS
approved

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Last modified February 22 09:41 EST 2024. Contains 370250 sequences. (Running on oeis4.)