A241108 - OEIS

%I #4 Apr 16 2014 06:51:58

%S 1,1,1,2,4,2,4,11,11,4,8,36,58,36,8,16,116,294,294,116,16,32,376,1522,

%T 2436,1522,376,32,64,1216,7846,19814,19814,7846,1216,64,128,3936,

%U 40418,162776,259388,162776,40418,3936,128,256,12736,208374,1333934,3374086

%N T(n,k)=Number of nXk 0..2 arrays with no element equal to one or three horizontal or vertical neighbors, with new values 0..2 introduced in row major order

%C Table starts

%C ...1.....1.......2.........4...........8.............16...............32

%C ...1.....4......11........36.........116............376.............1216

%C ...2....11......58.......294........1522...........7846............40418

%C ...4....36.....294......2436.......19814.........162776..........1333934

%C ...8...116....1522.....19814......259388........3374086.........44030862

%C ..16...376....7846....162776.....3374086.......70145916.......1454236806

%C ..32..1216...40418...1333934....44030862.....1454236806......48054344508

%C ..64..3936..208374..10937316...574246744....30189380016....1586763763374

%C .128.12736.1074002..89651534..7489718098...626548445696...52415988665902

%C .256.41216.5535686.734979136.97685897406.13004327687556.1731396543937826

%H R. H. Hardin, <a href="/A241108/b241108.txt">Table of n, a(n) for n = 1..144</a>

%F Empirical for column k:

%F k=1: a(n) = 2*a(n-1) for n>2

%F k=2: a(n) = 2*a(n-1) +4*a(n-2) for n>4

%F k=3: a(n) = 3*a(n-1) +8*a(n-2) +16*a(n-3)

%F k=4: [order 10]

%F k=5: [order 26]

%F k=6: [order 76]

%e Some solutions for n=4 k=4

%e ..0..1..1..2....0..1..1..2....0..1..2..0....0..1..0..2....0..1..2..0

%e ..2..1..1..0....2..1..1..1....1..2..1..2....1..0..2..1....1..0..0..2

%e ..1..0..2..1....0..2..1..1....2..1..2..0....2..1..1..0....2..0..0..0

%e ..0..2..0..2....2..0..2..0....1..2..0..2....0..1..1..2....1..2..0..0

%Y Column 1 is A000079(n-2)

%Y Column 2 is A206687

%K nonn,tabl

%O 1,4

%A _R. H. Hardin_, Apr 16 2014