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A103461 (-10)^n+1-0^n. 0
1, -9, 101, -999, 10001, -99999, 1000001, -9999999, 100000001, -999999999, 10000000001, -99999999999, 1000000000001, -9999999999999, 100000000000001, -999999999999999, 10000000000000001, -99999999999999999, 1000000000000000001, -9999999999999999999 (list; graph; refs; listen; history; internal format)
OFFSET

0,2

FORMULA

G.f.: (1+10x^2)/((1-x)(1+10x)); a(n)=sum{k=0..n, binomial(n, k)*0^(k(n-k))*(-10)^k}.

CROSSREFS

Sequence in context: A060150 A202833 A174509 * A101563 A007133 A183518

Adjacent sequences:  A103458 A103459 A103460 * A103462 A103463 A103464

KEYWORD

easy,sign

AUTHOR

Paul Barry (pbarry(AT)wit.ie), Feb 07 2005

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Last modified February 17 12:38 EST 2012. Contains 206021 sequences.