A143750 a(n)=10^C(n,2)*(1-10^n)/9.

0, -1, -110, -111000, -1111000000, -111110000000000, -111111000000000000000, -1111111000000000000000000000, -111111110000000000000000000000000000, -111111111000000000000000000000000000000000000

Offset: 0

Author

Paul Barry, Aug 30 2008

Keywords

• easy
• sign

Comments

Hankel transform of A143749.

Formula

a(n)=-10^C(n,2)*A002275(n);