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A250942 T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with nondecreasing x(i,j)+x(i,j-1) in the i direction and nondecreasing absolute value of x(i,j)-x(i-1,j) in the j direction 14

%I #4 Nov 28 2014 19:03:22

%S 37,155,125,599,699,413,2247,3355,2812,1333,8189,15431,16208,10528,

%T 4213,29281,67595,87529,71014,37477,13111,103093,287045,442409,444421,

%U 289407,128507,40357,358683,1188599,2130148,2572787,2067987,1115035,428095

%N T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with nondecreasing x(i,j)+x(i,j-1) in the i direction and nondecreasing absolute value of x(i,j)-x(i-1,j) in the j direction

%C Table starts

%C ......37......155.......599.......2247........8189........29281........103093

%C .....125......699......3355......15431.......67595.......287045.......1188599

%C .....413.....2812.....16208......87529......442409......2130148.......9865706

%C ....1333....10528.....71014.....444421.....2572787.....14019652......72722706

%C ....4213....37477....289407....2067987....13550488.....82716842.....475951361

%C ...13111...128507...1115035....8976385....65910564....447407616....2839711239

%C ...40357...428095...4106983...36809498...300230097...2251710502...15686582837

%C ..123271..1394237..14585505..144007880..1294549437..10665462156...81197881457

%C ..374509..4460779..50276307..541598982..5327479262..47958734697..397409857238

%C .1133503.14073313.169096201.1969991292.21062394646.206139574253.1852256126330

%H R. H. Hardin, <a href="/A250942/b250942.txt">Table of n, a(n) for n = 1..144</a>

%F Empirical for column k:

%F k=1: a(n) = 8*a(n-1) -23*a(n-2) +28*a(n-3) -12*a(n-4) for n>6

%F k=2: [order 7] for n>11

%F k=3: [order 15] for n>21

%F k=4: [order 21] for n>29

%F k=5: [order 27] for n>37

%F k=6: [order 33] for n>45

%F k=7: [order 39] for n>53

%F Empirical for row n:

%F n=1: a(n) = 6*a(n-1) -6*a(n-2) -15*a(n-3) +14*a(n-4) +12*a(n-5)

%F n=2: [order 11]

%F n=3: [order 21]

%F n=4: [order 38]

%F n=5: [order 60]

%F n=6: [order 88]

%e Some solutions for n=3 k=4

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

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

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

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

%Y Column 1 is A250891

%K nonn,tabl

%O 1,1

%A _R. H. Hardin_, Nov 28 2014

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Last modified April 25 11:39 EDT 2024. Contains 371969 sequences. (Running on oeis4.)