0,2

Mix A004171(2n)-1, A004171(2n+1)+1. Also a(n+1)-4a(n)= period 2: repeat 5, -5.

Sequence in context: A004126 A118444 A048374 this_sequence A145950 A159279 A048547

Adjacent sequences: A140320 A140321 A140322 this_sequence A140324 A140325 A140326

nonn

Paul Curtz (bpcrtz(AT)free.fr), May 26 2008