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A181250 Number of nX7 binary matrices with no 2X2 block having four 1's 1
128, 11772, 1169792, 114142368, 11185495872, 1095020802848, 107224417436160, 10498818149889952, 1027999596778673856, 100657027683287334528, 9855884014448812881664, 965043721129265059674752 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 7 of A181253

LINKS

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

FORMULA

Empirical: a(n)=68*a(n-1)+3106*a(n-2)-10300*a(n-3)-731184*a(n-4)+3930848*a(n-5)+47046600*a(n-6)-471525808*a(n-7)+1012118640*a(n-8)+2396096576*a(n-9)-9445394304*a(n-10)-4382776896*a(n-11)+29415041536*a(n-12)+8676097024*a(n-13)-36065068032*a(n-14)-14871987200*a(n-15)+10138337280*a(n-16)+2907136000*a(n-17)-1119682560*a(n-18)

CROSSREFS

Sequence in context: A232995 A181242 A035817 * A001661 A239190 A184760

Adjacent sequences:  A181247 A181248 A181249 * A181251 A181252 A181253

KEYWORD

nonn

AUTHOR

R. H. Hardin Oct 10 2010

STATUS

approved

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Last modified April 16 10:39 EDT 2014. Contains 240577 sequences.