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A231227 T(n,k)=Number of (n+2)X(k+2) 0..2 arrays with no element unequal to a strict majority of its horizontal, vertical, diagonal and antidiagonal neighbors, with values 0..2 introduced in row major order 8

%I #4 Nov 05 2013 18:36:50

%S 1,2,2,3,4,3,6,8,8,6,11,17,21,17,11,22,45,54,54,45,22,43,103,185,182,

%T 185,103,43,86,264,552,812,812,552,264,86,171,676,1799,2962,4298,2962,

%U 1799,676,171,342,1724,5900,12179,19935,19935,12179,5900,1724,342,683,4501

%N T(n,k)=Number of (n+2)X(k+2) 0..2 arrays with no element unequal to a strict majority of its horizontal, vertical, diagonal and antidiagonal neighbors, with values 0..2 introduced in row major order

%C Table starts

%C ...1....2.....3......6.......11........22.........43.........86........171

%C ...2....4.....8.....17.......45.......103........264........676.......1724

%C ...3....8....21.....54......185.......552.......1799.......5900......19185

%C ...6...17....54....182......812......2962......12179......50196.....205057

%C ..11...45...185....812.....4298.....19935.....102113.....524113....2687777

%C ..22..103...552...2962....19935....117178.....748665....4870988...31483476

%C ..43..264..1799..12179...102113....748665....5930126...48317804..390225796

%C ..86..676..5900..50196...524113...4870988...48317804..495739986.5038813008

%C .171.1724.19185.205057..2687777..31483476..390225796.5038813008

%C .342.4501.63834.864270.14197596.210326324.3267809753

%H R. H. Hardin, <a href="/A231227/b231227.txt">Table of n, a(n) for n = 1..144</a>

%F Empirical for column k:

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

%F k=2: [order 11]

%F k=3: [order 13]

%F k=4: [order 96]

%e Some solutions for n=5 k=4

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

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

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

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

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

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

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

%Y Column 1 is A005578

%K nonn,tabl

%O 1,2

%A _R. H. Hardin_, Nov 05 2013

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Last modified April 16 02:53 EDT 2024. Contains 371696 sequences. (Running on oeis4.)