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A201989 T(n,k)=Number of nXk zero-sum -3..3 arrays with rows and columns lexicographically nondecreasing 7

%I

%S 1,4,4,8,77,8,18,1170,1170,18,32,14107,134217,14107,32,58,139471,

%T 11648559,11648559,139471,58,94,1177568,803133854,7375608084,

%U 803133854,1177568,94,151,8721417,46034224561,3674187761233,3674187761233

%N T(n,k)=Number of nXk zero-sum -3..3 arrays with rows and columns lexicographically nondecreasing

%C Table starts

%C ...1........4..............8.................18...................32

%C ...4.......77...........1170..............14107...............139471

%C ...8.....1170.........134217...........11648559............803133854

%C ..18....14107.......11648559.........7375608084........3674187761233

%C ..32...139471......803133854......3674187761233....13189629907532856

%C ..58..1177568....46034224561...1507315600099908.38785259210265819578

%C ..94..8721417..2263314310579.526500713340421071

%C .151.57801225.97590406110264

%H R. H. Hardin, <a href="/A201989/b201989.txt">Table of n, a(n) for n = 1..59</a>

%e Some solutions for n=3 k=3

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

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

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

%Y Column 1 is A001977

%K nonn,tabl

%O 1,2

%A _R. H. Hardin_ Dec 07 2011

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Last modified January 26 13:09 EST 2022. Contains 350598 sequences. (Running on oeis4.)