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

1,12

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

Crossrefs

Sequence in context: A298957 A298902 A298963 * A233270 A241291 A317741

Adjacent sequences: A180757 A180758 A180759 * A180761 A180762 A180763

Keyword

nonn,tabl

Author

R. H. Hardin Sep 20 2010

Status

approved