A051796 a(n)=sum((-1)^i*a(i),i=n-9..n-1); with a(i)=i for i=1..9.

1, 2, 3, 4, 5, 6, 7, 8, 9, -5, -9, -2, -1, -4, -3, -6, -5, -8, -7, 5, 1, 2, 3, 4, 5, 6, 7, 8, 9, -5, -9, -2, -1, -4, -3, -6, -5, -8, -7, 5, 1, 2, 3, 4, 5, 6, 7, 8, 9, -5, -9, -2, -1, -4, -3, -6, -5, -8, -7, 5, 1, 2, 3, 4, 5, 6, 7, 8, 9, -5, -9, -2, -1, -4, -3, -6, -5, -8, -7, 5, 1, 2, 3, 4, 5, 6, 7, 8, 9, -5, -9, -2, -1, -4, -3, -6, -5, -8, -7, 5, 1

Offset

1,2

Links

Table of n, a(n) for n=1..101.

Formula

a(n+20)=a(n)

Crossrefs

Sequence in context: A028900 A081596 A061500 * A257296 A093030 A122425

Adjacent sequences: A051793 A051794 A051795 * A051797 A051798 A051799

Keyword

easy,sign

Author

Klaus Strassburger (strass(AT)ddfi.uni-duesseldorf.de), Dec 10 1999

Extensions

More terms from Larry Reeves (larryr(AT)acm.org), Feb 05 2001

Status

approved