login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A317436 T(n,k)=Number of nXk 0..1 arrays with every element unequal to 1, 2, 3, 5, 6, 7 or 8 king-move adjacent elements, with upper left element zero. 7

%I #4 Jul 27 2018 22:12:26

%S 0,1,1,1,7,1,2,16,16,2,3,45,61,45,3,5,120,201,201,120,5,8,333,863,

%T 1140,863,333,8,13,928,3666,6964,6964,3666,928,13,21,2613,14831,39216,

%U 67214,39216,14831,2613,21,34,7400,61638,225065,594763,594763,225065,61638

%N T(n,k)=Number of nXk 0..1 arrays with every element unequal to 1, 2, 3, 5, 6, 7 or 8 king-move adjacent elements, with upper left element zero.

%C Table starts

%C ..0....1......1.......2.........3...........5.............8.............13

%C ..1....7.....16......45.......120.........333...........928...........2613

%C ..1...16.....61.....201.......863........3666.........14831..........61638

%C ..2...45....201....1140......6964.......39216........225065........1322225

%C ..3..120....863....6964.....67214......594763.......5282805.......47791350

%C ..5..333...3666...39216....594763.....8362442.....113897676.....1604462254

%C ..8..928..14831..225065...5282805...113897676....2326497716....49910970516

%C .13.2613..61638.1322225..47791350..1604462254...49910970516..1648608723762

%C .21.7400.255772.7638732.429692708.22617426590.1074044399955.54927936213579

%H R. H. Hardin, <a href="/A317436/b317436.txt">Table of n, a(n) for n = 1..180</a>

%F Empirical for column k:

%F k=1: a(n) = a(n-1) +a(n-2)

%F k=2: a(n) = 2*a(n-1) +5*a(n-2) -2*a(n-3) -12*a(n-4) -8*a(n-5) for n>6

%F k=3: [order 20] for n>21

%F k=4: [order 68] for n>70

%e Some solutions for n=5 k=4

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

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

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

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

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

%Y Column 1 is A000045(n-1).

%Y Column 2 is A304013.

%K nonn,tabl

%O 1,5

%A _R. H. Hardin_, Jul 27 2018

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified April 24 02:28 EDT 2024. Contains 371917 sequences. (Running on oeis4.)