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A143750
a(n)=10^C(n,2)*(1-10^n)/9.
1
0, -1, -110, -111000, -1111000000, -111110000000000, -111111000000000000000, -1111111000000000000000000000, -111111110000000000000000000000000000, -111111111000000000000000000000000000000000000
OFFSET
0,3
COMMENTS
Hankel transform of A143749.
FORMULA
a(n)=-10^C(n,2)*A002275(n);
CROSSREFS
Sequence in context: A329126 A329338 A203718 * A371032 A192844 A234512
KEYWORD
easy,sign
AUTHOR
Paul Barry, Aug 30 2008
STATUS
approved