Hello SeqFans, I've found 9 sequences with the same name: Number of polyhexes of class PF2 It would be nice to have some differentiating comments there. As a mnimimum they should cross-reference each other. Here is the list: A026106 A026118 A026298 A030519 A030520 A030525 A030529 A030532 A030534 Tanya