0,1

Row sums of A127244. a(n)=mod(A127246(n),2). 0's occur at positions indexed by the odious numbers given by A091855.

a(n)=sum{k=0..n, (-1)^(n-k)*Product{j=0..n-k-1,A010060(n-j)}}

Sequence in context: A005614 A071036 A057078 this_sequence A088150 A117567 A117568

Adjacent sequences: A127242 A127243 A127244 this_sequence A127246 A127247 A127248

easy,nonn

Paul Barry (pbarry(AT)wit.ie), Jan 10 2007