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

1,2

Comments

Column 9 of A180760

Links

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

Crossrefs

Sequence in context: A168240 A123779 A123839 * A197121 A175461 A272627

Adjacent sequences: A180755 A180756 A180757 * A180759 A180760 A180761

Keyword

nonn

Author

R. H. Hardin Sep 20 2010

Status

approved