A181249 Number of nX6 binary matrices with no 2X2 block having four 1's

64, 3105, 160697, 8191392, 419045269, 21418970801, 1095020802848, 55979092539545, 2861765993703849, 146298965997241152, 7479088292930771309, 382345515897175884705, 19546245848381921238016, 999242067236417336040593

Offset

1,1

Comments

Column 6 of A181253

Links

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

Formula

Empirical: a(n)=33*a(n-1)+908*a(n-2)+1687*a(n-3)-37947*a(n-4)-16572*a(n-5)+513993*a(n-6)-663729*a(n-7)-486540*a(n-8)+617409*a(n-9)+191835*a(n-10)-49140*a(n-11)

Crossrefs

Sequence in context: A221090 A342709 A264094 * A260857 A183814 A281343

Adjacent sequences: A181246 A181247 A181248 * A181250 A181251 A181252

Keyword

nonn

Author

R. H. Hardin Oct 10 2010

Status

approved