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A101679
A bisection of A101678.
1
1, 9, 89, 991, 9909, 88991, 899911, 9999009, 99990089, 899910991, 8899099911, 99089999009, 990999990091, 8899999911009, 89999999100089, 999999990000991, 9999999900009909, 89999999100088991, 889999991100899911
OFFSET
0,2
FORMULA
a(n)=sum{k=0..n, (-1)^A010060(2n-2k)*mod(binomial(2n-k, k), 2)10^k}.
CROSSREFS
Sequence in context: A095722 A199759 A069573 * A075507 A094935 A258388
KEYWORD
easy,nonn
AUTHOR
Paul Barry, Dec 11 2004
STATUS
approved