A180758 Half the number of nX9 binary arrays with each element equal to at least two neighbors.

0, 21, 67, 2059, 41755, 986376, 22238670, 514990479, 11843513563, 273193577866, 6295815062637, 145178091690740, 3347707869286493, 77204310077778551, 1780484848971706031, 41062118413701907548, 946988189894419322573

Offset: 1

Author

R. H. Hardin Sep 20 2010

Keywords

• nonn

Comments

Column 9 of A180760

Links

• R. H. Hardin, Table of n, a(n) for n=1..99