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!)
A251923 T(n,k)=Number of (n+2)X(k+2) 0..3 arrays with every 3X3 subblock row and column sum 2 4 5 or 7 and every diagonal and antidiagonal sum not 2 4 5 or 7 9

%I #4 Dec 11 2014 06:40:05

%S 1194,1914,1914,2524,3054,2524,3260,4624,4624,3260,5810,4938,6086,

%T 4938,5810,8932,10704,10820,10820,10704,8932,12872,19964,27366,25882,

%U 27366,19964,12872,21518,34396,59760,80438,80438,59760,34396,21518,33814,76834

%N T(n,k)=Number of (n+2)X(k+2) 0..3 arrays with every 3X3 subblock row and column sum 2 4 5 or 7 and every diagonal and antidiagonal sum not 2 4 5 or 7

%C Table starts

%C ..1194...1914....2524.....3260......5810.......8932.......12872........21518

%C ..1914...3054....4624.....4938.....10704......19964.......34396........76834

%C ..2524...4624....6086....10820.....27366......59760......153792.......424648

%C ..3260...4938...10820....25882.....80438.....253148......856022......3063064

%C ..5810..10704...27366....80438....340800....1316762.....5742474.....24518672

%C ..8932..19964...59760...253148...1316762....6752446....36065236....196441982

%C .12872..34396..153792...856022...5742474...36065236...249690188...1610617806

%C .21518..76834..424648..3063064..24518672..196441982..1610617806..13251150646

%C .33814.157770.1188644.10885914.111841952.1066828482.11148308670.108350245070

%C .52274.319716.3247774.39035588.475675160.5808060274.71796251804.887270130550

%H R. H. Hardin, <a href="/A251923/b251923.txt">Table of n, a(n) for n = 1..390</a>

%F Empirical for column k:

%F k=1: [linear recurrence of order 59] for n>63

%F k=2: [order 66] for n>69

%F k=3: [order 73] for n>77

%F k=4: [order 69] for n>74

%e Some solutions for n=4 k=4

%e ..3..1..0..1..3..1....1..0..1..3..1..0....2..0..2..0..2..3....3..2..0..2..0..2

%e ..1..3..1..3..1..3....0..1..3..1..0..1....0..2..3..2..0..2....2..3..2..0..2..0

%e ..3..1..3..1..3..1....1..3..1..0..1..3....2..0..2..0..2..0....0..2..0..2..3..2

%e ..1..0..1..3..1..3....3..1..0..1..3..1....0..2..0..2..3..2....2..0..2..0..2..0

%e ..3..1..3..1..3..1....1..3..1..3..1..0....2..0..2..3..2..0....0..2..0..2..0..2

%e ..1..3..1..0..1..3....3..1..3..1..3..1....0..2..3..2..0..2....2..0..2..0..2..0

%K nonn,tabl

%O 1,1

%A _R. H. Hardin_, Dec 11 2014

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 18 12:53 EDT 2024. Contains 371780 sequences. (Running on oeis4.)