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%I #6 Sep 09 2017 12:01:01
%S 1,1,1,1,-1,1,1,1,1,1,1,3,4,3,1,1,1,1,1,1,1,1,-1,1,7,1,-1,1,1,1,4,1,1,
%T 4,1,1,1,3,1,3,-9,3,1,3,1,1,1,1,1,1,1,1,1,1,1,1,-1,4,7,1,14,1,7,4,-1,1
%N Square array T(n,m) of Witten index of a square n*m grid, read by antidiagonals.
%H P. Fendley, K. Schoutens and J. van Eerten, <a href="https://arxiv.org/abs/cond-mat/0408497">Hard squares at negative activity</a>, arXiv:cond-mat/0408497 [cond-mat.stat-mech], 2004; Jour. Phys. A: Math Gen. 38 (2005) 315.
%e The array begins:
%e 1 1 1 1 1 ...
%e 1 -1 1 3 1 ...
%e 1 1 4 1 1 ...
%e 1 3 1 7 1 ...
%e 1 1 1 1 -9 ...
%e ...
%K sign,tabl,more
%O 1,12
%A _Floor van Lamoen_, Oct 05 2005
%E Name edited by _Michel Marcus_, Sep 09 2017
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