OFFSET
0,43
FORMULA
G.f. of column k: Product_{j>=1} (1 - x^j)/(1 - x^(k*j)).
EXAMPLE
Square array begins:
1, 1, 1, 1, 1, ...
0, -1, -1, -1, -1, ...
0, 0, -1, -1, -1, ...
0, -1, 1, 0, 0, ...
0, 1, -1, 1, 0, ...
CROSSREFS
KEYWORD
sign,tabl
AUTHOR
Seiichi Manyama, May 14 2017
STATUS
approved