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A098611 10^n-(-1)^n. 2
0, 11, 99, 1001, 9999, 100001, 999999, 10000001, 99999999, 1000000001, 9999999999, 100000000001, 999999999999, 10000000000001, 99999999999999, 1000000000000001, 9999999999999999, 100000000000000001 (list; graph; refs; listen; history; internal format)
OFFSET

0,2

FORMULA

a(n) =A098610(n)-2*(-1)^n =A098609(n)/A098610(n).

CROSSREFS

Sequence in context: A190870 A037510 A037693 * A090337 A066329 A001738

Adjacent sequences:  A098608 A098609 A098610 * A098612 A098613 A098614

KEYWORD

easy,nonn

AUTHOR

Henry Bottomley (se16(AT)btinternet.com), Sep 17 2004

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Last modified February 15 23:34 EST 2012. Contains 205860 sequences.