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 A224281 T(n,k)=Number of nXk 0..3 arrays with diagonals and rows unimodal and antidiagonals nondecreasing 12

%I #4 Apr 02 2013 14:45:54

%S 4,16,16,50,160,64,130,984,1600,256,296,4580,13683,16000,1024,610,

%T 17723,84132,186516,160000,4096,1163,59792,442089,1334973,2596992,

%U 1600000,16384,2083,180821,2059793,8073038,21348990,37128051,16000000,65536,3544

%N T(n,k)=Number of nXk 0..3 arrays with diagonals and rows unimodal and antidiagonals nondecreasing

%C Table starts

%C .......4..........16............50............130.............296

%C ......16.........160...........984...........4580...........17723

%C ......64........1600.........13683..........84132..........442089

%C .....256.......16000........186516........1334973.........8073038

%C ....1024......160000.......2596992.......21348990.......137489538

%C ....4096.....1600000......37128051......356222482......2425304290

%C ...16384....16000000.....537465766.....6172817040.....45275725025

%C ...65536...160000000....7804602744...109166159263....883012703273

%C ..262144..1600000000..113382138975..1947747629183..17667432461262

%C .1048576.16000000000.1646661944858.34864494529806.358042017265316

%H R. H. Hardin, <a href="/A224281/b224281.txt">Table of n, a(n) for n = 1..199</a>

%F Empirical: columns k=1..4 have recurrences of order 1,1,25,52 for n>0,0,26,59

%F Empirical: rows n=1..6 are polynomials of degree 6*n for k>0,0,3,7,11,15

%e Some solutions for n=3 k=4

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

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

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

%Y Column 1 is A000302

%Y Column 2 is 16*10^(n-1)

%Y Row 1 is A223659

%Y Row 2 is A224058

%K nonn,tabl

%O 1,1

%A _R. H. Hardin_ Apr 02 2013

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Last modified September 13 10:14 EDT 2024. Contains 375904 sequences. (Running on oeis4.)