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A111028 Square array T(n,m) of Witten index of a square n*m grid, read by antidiagonals. 0
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, 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 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,12

LINKS

Table of n, a(n) for n=1..66.

P. Fendley, K. Schoutens and J. van Eerten, Hard squares at negative activity, arXiv:cond-mat/0408497 [cond-mat.stat-mech], 2004; Jour. Phys. A: Math Gen. 38 (2005) 315.

EXAMPLE

The array begins:

1   1   1   1   1 ...

1  -1   1   3   1 ...

1   1   4   1   1 ...

1   3   1   7   1 ...

1   1   1   1  -9 ...

...

CROSSREFS

Sequence in context: A108481 A078070 A254745 * A201162 A096646 A306234

Adjacent sequences:  A111025 A111026 A111027 * A111029 A111030 A111031

KEYWORD

sign,tabl,more

AUTHOR

Floor van Lamoen, Oct 05 2005

EXTENSIONS

Name edited by Michel Marcus, Sep 09 2017

STATUS

approved

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Last modified November 17 13:33 EST 2019. Contains 329230 sequences. (Running on oeis4.)