A111028 Square array T(n,m) of Witten index of a square n*m grid, read by antidiagonals.

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

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: A367076 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