The On-Line Encyclopedia of Integer Sequences (OEIS)

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A051796

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

#3 by N. J. A. Sloane at Sat Nov 10 03:00:00 EST 2007

NAME

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

KEYWORD

easy,sign,new

#2 by N. J. A. Sloane at Fri May 16 03:00:00 EDT 2003

NAME

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

DATA

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

KEYWORD

easy,nice,sign,done,new

easy,sign

AUTHOR

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

EXTENSIONS

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

#1 by N. J. A. Sloane at Sat Dec 11 03:00:00 EST 1999

NAME

a(n)=sum((-1)**i*a(i),i=n-9..n-1), a(i)=i, i=1..9.

DATA

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

OFFSET

1,2

FORMULA

a(n+20)=a(n)

KEYWORD

easy,nice,sign,done

AUTHOR

Klaus Strassburger (strass@dfi.uni-duesseldorf.de), Dec 10 1999

STATUS

approved