[seqfan] A119558

[Harvey P. Dale]

            This Mma program implements the definition of the above
sequence but generates quite different terms:

 

RecurrenceTable[{a[1]==a[2]==0,a[3]==1,a[n]==Abs[a[n-1]-a[n-2]]+(-1)^(n
a[n-3])},a,{n,80}]

 

Is the Mma program wrong, or are the terms of the sequence wrong?

 

            Best,

            Harvey

P.S. In any event, given the definition of the sequence, shouldn't the
offset be changed?