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

 


T(n,k)=Number of nXk 0..2 arrays with diagonals and rows unimodal and antidiagonals nondecreasing
12

%I #4 Apr 03 2013 11:04:04

%S 3,9,9,22,54,27,46,218,324,81,86,698,1586,1944,243,148,1915,5996,

%T 11361,11664,729,239,4690,20214,45453,82700,69984,2187,367,10511,

%U 61953,164514,345875,615481,419904,6561,541,21919,174378,562760,1258372,2717759

%N T(n,k)=Number of nXk 0..2 arrays with diagonals and rows unimodal and antidiagonals nondecreasing

%C Table starts

%C .....3........9.........22..........46..........86..........148..........239

%C .....9.......54........218.........698........1915.........4690........10511

%C ....27......324.......1586........5996.......20214........61953.......174378

%C ....81.....1944......11361.......45453......164514.......562760......1825800

%C ...243....11664......82700......345875.....1258372......4420701.....15312504

%C ...729....69984.....615481.....2717759.....9829605.....33934344....118317987

%C ..2187...419904....4634768....22071219....80083648....268379906....911404794

%C ..6561..2519424...35003328...182843194...677557164...2215451575...7236130163

%C .19683.15116544..264487714..1528645389..5882182248..19023816444..59751261572

%C .59049.90699264.1997888432.12825738594.51821072499.168305254414.512310103541

%H R. H. Hardin, <a href="/A224310/b224310.txt">Table of n, a(n) for n = 1..337</a>

%F Empirical for column k:

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

%F k=2: a(n) = 6*a(n-1)

%F k=3: [order 17]

%F k=4: [order 30] for n>35

%F k=5: [order 61] for n>69

%F k=6: [order 88] for n>98

%F Empirical: rows n=1..7 are polynomials of degree 4*n for k>0,0,3,6,9,12,15

%e Some solutions for n=3 k=4

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

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

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

%Y Column 1 is A000244

%Y Column 2 is 9*6^(n-1)

%Y Row 1 is A223718

%Y Row 2 is A223927

%K nonn,tabl

%O 1,1

%A _R. H. Hardin_ Apr 03 2013

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | 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 September 23 00:23 EDT 2024. Contains 376140 sequences. (Running on oeis4.)