0,2
a(1)=2 because the first differences of 0,1 and 1,0 are 1 and -1.
Sequence in context: A082618 A083758 A127494 this_sequence A007932 A035122 A085305
Adjacent sequences: A130800 A130801 A130802 this_sequence A130804 A130805 A130806
nonn
Ron Hardin (rhh(AT)cadence.com), Aug 20 2007
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