A101679 A bisection of A101678.

1, 9, 89, 991, 9909, 88991, 899911, 9999009, 99990089, 899910991, 8899099911, 99089999009, 990999990091, 8899999911009, 89999999100089, 999999990000991, 9999999900009909, 89999999100088991, 889999991100899911

Offset

0,2

Links

Table of n, a(n) for n=0..18.

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

Adjacent sequences: A101676 A101677 A101678 * A101680 A101681 A101682

Keyword

easy,nonn

Author

Paul Barry, Dec 11 2004

Status

approved