>> > Apparently seqfans also have a bit of disagreement over whether 0^0 = >> > 1 or 0 or undefined! That seems to be the reason for the three >> > different sequences (the third being A062970). Here's a page in favor of 0^0 = 1: http://mathforum.org/dr.math/faq/faq.0.to.0.power.html Tony