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A216084 T(n,k) = Number of horizontal and antidiagonal neighbor colorings of the odd squares of an n X k array with new integer colors introduced in row major order. 13

%I #6 May 09 2017 19:11:24

%S 1,1,1,1,1,1,1,2,3,2,1,4,5,7,2,2,12,42,52,27,5,2,34,136,602,203,87,5,

%T 5,136,2440,12840,15144,4140,409,15,5,500,10900,322768,373780,433252,

%U 21147,1657,15,15,2440,322776,12297870,87852160,99827160,18378580,678570,9089

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

%C Table starts

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

%C ..1.....1.........2.............4.................12......................34

%C ..1.....3.........5............42................136....................2440

%C ..2.....7........52...........602..............12840..................322768

%C ..2....27.......203.........15144.............373780................87852160

%C ..5....87......4140........433252...........99827160.............33093252880

%C ..5...409.....21147......18378580.........5116799368..........20358402201792

%C .15..1657....678570.....839621092......2751754706832.......15604440074084672

%C .15..9089...4213597...52183667212....212339816996032....17423570614012565376

%C .52.43833.190899322.3404551437592.194478305002268064.22946861101272125055616

%H R. H. Hardin, <a href="/A216084/b216084.txt">Table of n, a(n) for n = 1..124</a>

%e Some solutions for n=4 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..0..x....1..x..2..x....2..x..3..x....2..x..3..x....2..x..3..x

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

%e ..4..x..3..x....3..x..1..x....5..x..4..x....0..x..3..x....3..x..5..x

%Y Column 1 is A000110(floor(n/2)).

%Y Row 2 is A215953.

%K nonn,tabl

%O 1,8

%A _R. H. Hardin_, Sep 01 2012

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Last modified March 28 22:04 EDT 2024. Contains 371254 sequences. (Running on oeis4.)