A181248 Number of nX5 binary matrices with no 2X2 block having four 1's.

32, 819, 22077, 587920, 15701273, 419045269, 11185495872, 298561305103, 7969215344753, 212714316418464, 5677773794982333, 151551208150533689, 4045206823611571168, 107974712600136074779, 2882062422625926933109

Offset: 1

Author

R. H. Hardin Oct 10 2010

Keywords

• nonn

Comments

Column 5 of A181253

Links

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

Formula

Empirical: a(n)=20*a(n-1)+188*a(n-2)-192*a(n-3)-1660*a(n-4)+2804*a(n-5)-507*a(n-6)-624*a(n-7)