A180760 T(n,k)=half the number of nXk binary arrays with each element equal to at least two neighbors.

0, 0, 0, 0, 1, 0, 0, 1, 1, 0, 0, 2, 1, 2, 0, 0, 3, 2, 2, 3, 0, 0, 5, 3, 9, 3, 5, 0, 0, 8, 7, 21, 21, 7, 8, 0, 0, 13, 14, 70, 86, 70, 14, 13, 0, 0, 21, 31, 207, 410, 410, 207, 31, 21, 0, 0, 34, 67, 658, 1874, 2986, 1874, 658, 67, 34, 0, 0, 55, 148, 2059, 8840, 20205, 20205, 8840, 2059, 148

Offset: 1

Author

R. H. Hardin Sep 20 2010

Keywords

• nonn
• tabl

Comments

Table starts

.0..0...0....0......0.......0.........0..........0............0.............0

.0..1...1....2......3.......5.........8.........13...........21............34

.0..1...1....2......3.......7........14.........31...........67...........148

.0..2...2....9.....21......70.......207........658.........2059..........6521

.0..3...3...21.....86.....410......1874.......8840........41755........197883

.0..5...7...70....410....2986.....20205.....141313.......986376.......6925085

.0..8..14..207...1874...20205....205020....2141384.....22238670.....232041425

.0.13..31..658...8840..141313...2141384...33329847....514990479....7988200496

.0.21..67.2059..41755..986376..22238670..514990479..11843513563..273193577866

.0.34.148.6521.197883.6925085.232041425.7988200496.273193577866.9371551715962

Links

• R. H. Hardin, Table of n, a(n) for n=1..264