A201983 - OEIS

%I #6 Dec 18 2015 18:17:56

%S 1,77,134217,7375608084,13189629907532856

%N Number of n X n zero-sum -3..3 arrays with rows and columns lexicographically nondecreasing

%C Diagonal of A201989

%e Some solutions for n=3

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

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

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

%K nonn

%O 1,2

%A _R. H. Hardin_ Dec 07 2011