I wrote: >... >(The sequence begins: 2, 1, 2, 0, 4, 2, 0, 2, 6, 4, 6, 4,... >... I forgot to add the signs: The sequence really begins: 2, 1, 2, 0, 4, -2, 0, 2, 6, -4, 6, -4,... Sorry about that! Leroy Quet