OFFSET
1,2
COMMENTS
Let M(infinity) be the infinite matrix with coefficient m(i,j) i>=1, j>=1 defined as follows : M(0)=1 and M(k) is the 2^k X 2^k matrix following the recursion : +M(k-1)-M(k-1) M(k)= -M(k-1)-M(k-1)
FORMULA
EXAMPLE
M(2)=/1,-1/-1,-1/ then a(2)=detM(2)=-2
CROSSREFS
KEYWORD
sign
AUTHOR
Benoit Cloitre, Jun 03 2004
STATUS
approved