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A185481 Number of (n+1)X4 binary arrays with every 2X2 subblock determinant equal to some horizontal or vertical neighbor 2X2 subblock determinant 1
76, 684, 4740, 35672, 260172, 1923780, 14150114, 104300522, 768160718, 5659345888, 41689048326, 307115065572, 2262407666898, 16666499139956, 122776828884698, 904459332925242, 6662871472736956, 49083319176509768 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A185487

LINKS

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

FORMULA

Empirical: a(n)=11*a(n-1)-23*a(n-2)-69*a(n-3)+409*a(n-4)-768*a(n-5)-571*a(n-6)+4622*a(n-7)-5573*a(n-8)+1199*a(n-9)+2111*a(n-10)-8400*a(n-11)+12500*a(n-12)-4419*a(n-13)-490*a(n-14)+204*a(n-15)-1290*a(n-16)+1264*a(n-17)-1204*a(n-18)+320*a(n-19) for n>22

EXAMPLE

Some solutions for 3X4

..0..1..0..1....0..0..0..0....1..0..0..0....0..0..1..1....0..0..1..1

..0..1..0..1....0..1..1..0....1..1..0..0....0..0..1..1....0..0..0..0

..0..1..0..0....0..0..1..1....0..1..0..1....0..1..1..0....1..0..0..1

CROSSREFS

Sequence in context: A200167 A178262 A253411 * A007250 A137061 A230944

Adjacent sequences:  A185478 A185479 A185480 * A185482 A185483 A185484

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 28 2011

STATUS

approved

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Last modified November 19 18:39 EST 2019. Contains 329323 sequences. (Running on oeis4.)