login

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

T(n,k)=Number of horizontal, vertical, diagonal and antidiagonal neighbor colorings of the odd squares of an nXk array with new integer colors introduced in row major order
6

%I #4 Aug 22 2012 19:26:20

%S 1,1,1,1,1,1,1,1,1,1,1,2,1,2,1,2,5,8,8,5,2,2,15,22,78,22,15,2,5,52,

%T 364,1250,1250,364,52,5,5,203,1474,29084,24236,29084,1474,203,5,15,

%U 877,40612,908408,4851360,4851360,908408,40612,877,15,15,4140,211784,36224616

%N T(n,k)=Number of horizontal, vertical, diagonal and antidiagonal neighbor colorings of the odd squares of an nXk array with new integer colors introduced in row major order

%C Table starts

%C ..1.....1.......1..........1...........1............2............2

%C ..1.....1.......1..........2...........5...........15...........52

%C ..1.....1.......1..........8..........22..........364.........1474

%C ..1.....2.......8.........78........1250........29084.......908408

%C ..1.....5......22.......1250.......24236......4851360....190497926

%C ..2....15.....364......29084.....4851360...1396243937.621070325112

%C ..2....52....1474.....908408...190497926.621070325112

%C ..5...203...40612...36224616.83943993818

%C ..5...877..211784.1780689974

%C .15..4140.8520924

%C .15.21147

%C .52

%H R. H. Hardin, <a href="/A215745/b215745.txt">Table of n, a(n) for n = 1..84</a>

%e Some solutions for n=3 k=4

%e ..x..0..x..1....x..0..x..1....x..0..x..1....x..0..x..1....x..0..x..1

%e ..2..x..3..x....2..x..3..x....2..x..3..x....2..x..3..x....1..x..2..x

%e ..x..4..x..0....x..4..x..2....x..1..x..4....x..1..x..2....x..3..x..0

%Y Column 2 is A000110(n-2)

%K nonn,tabl

%O 1,12

%A _R. H. Hardin_ Aug 22 2012