A240783 - OEIS

%I #4 Apr 12 2014 18:11:56

%S 1,1,2,1,3,4,1,4,11,8,1,6,20,34,16,1,9,46,97,111,32,1,14,97,305,459,

%T 361,64,1,22,216,959,2167,2187,1172,128,1,35,472,3033,10150,15332,

%U 10442,3809,256,1,56,1043,9581,47920,106411,108509,49861,12377,512,1,90,2296,30354

%N T(n,k)=Number of nXk 0..1 arrays with no element equal to fewer vertical neighbors than horizontal neighbors, with new values 0..1 introduced in row major order

%C Table starts

%C ...1.....1.......1........1..........1...........1.............1..............1

%C ...2.....3.......4........6..........9..........14............22.............35

%C ...4....11......20.......46.........97.........216...........472...........1043

%C ...8....34......97......305........959........3033..........9581..........30354

%C ..16...111.....459.....2167......10150.......47920........226532........1071982

%C ..32...361....2187....15332.....106411......746346.......5228820.......36701371

%C ..64..1172...10442...108509....1120383....11677893.....121621207.....1269199948

%C .128..3809...49861...767834...11791412...182610635....2827515311....43857418181

%C .256.12377..238068..5434887..124095989..2856212777...65742420202..1515928067679

%C .512.40218.1136678.38467875.1306056075.44672652785.1528546759636.52397680462958

%H R. H. Hardin, <a href="/A240783/b240783.txt">Table of n, a(n) for n = 1..264</a>

%F Empirical for column k:

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

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

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

%F k=4: [order 22]

%F k=5: [order 54]

%F Empirical for row n:

%F n=1: a(n) = a(n-1)

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

%F n=3: a(n) = 2*a(n-1) +a(n-2) -a(n-3) -a(n-5)

%F n=4: [order 15]

%F n=5: [order 30] for n>34

%F n=6: [order 94]

%e Some solutions for n=4 k=4

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

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

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

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

%Y Column 1 is A000079(n-1)

%Y Column 2 is A180762

%Y Row 2 is A001611(n+1)

%K nonn,tabl

%O 1,3

%A _R. H. Hardin_, Apr 12 2014