This site is supported by donations to The OEIS Foundation.

 Please make a donation to keep the OEIS running. We are now in our 55th year. In the past year we added 12000 new sequences and reached 8000 citations (which often say "discovered thanks to the OEIS"). We need to raise money to hire someone to manage submissions, which would reduce the load on our editors and speed up editing. Other ways to donate

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A232038 T(n,k)=Number of (n+1)X(k+1) 0..1 arrays with every element equal to some horizontal, vertical or antidiagonal neighbor, with top left element zero 9

%I

%S 3,11,11,37,76,37,129,521,521,129,450,3588,6958,3588,450,1568,24719,

%T 94102,94102,24719,1568,5464,170270,1272579,2504637,1272579,170270,

%U 5464,19041,1172854,17207275,66684606,66684606,17207275,1172854,19041,66354

%N T(n,k)=Number of (n+1)X(k+1) 0..1 arrays with every element equal to some horizontal, vertical or antidiagonal neighbor, with top left element zero

%C Table starts

%C ......3........11...........37.............129.................450

%C .....11........76..........521............3588...............24719

%C .....37.......521.........6958...........94102.............1272579

%C ....129......3588........94102.........2504637............66684606

%C ....450.....24719......1272579........66684606..........3495632937

%C ...1568....170270.....17207275......1775039591........183196162778

%C ...5464...1172854....232668433.....47248648693.......9600712297741

%C ..19041...8078859...3146033503...1257683786423.....503143350126954

%C ..66354..55648831..42539187117..33477537844376...26368170190670693

%C .231230.383320506.575194892084.891118676917809.1381873328000465699

%H R. H. Hardin, <a href="/A232038/b232038.txt">Table of n, a(n) for n = 1..312</a>

%F Empirical for column k:

%F k=1: a(n) = 4*a(n-1) -2*a(n-2) +a(n-3) -a(n-4)

%F k=2: a(n) = 7*a(n-1) -5*a(n-3) -2*a(n-4) -a(n-5) +2*a(n-6) +2*a(n-7) for n>8

%F k=3: [order 20]

%F k=4: [order 42] for n>44

%F k=5: [order 95] for n>97

%e Some solutions for n=3 k=4

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

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

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

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

%K nonn,tabl

%O 1,1

%A _R. H. Hardin_, Nov 17 2013

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

Last modified December 14 09:41 EST 2019. Contains 329979 sequences. (Running on oeis4.)