This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A327734 #5 Sep 23 2019 20:31:36 %S A327734 0,0,0,0,0,0,1,2,7,12,31,57,126,232,484,900,1800,3388,6643,12594, %T A327734 24457,46624,90157,172680,333498,641088,1238664,2388357,4620006, %U A327734 8931052 %N A327734 Number of n-bead bracelet structures using exactly two different colored beads that are not self-equivalent under either a nonzero rotation or reversal (turning over bracelet). %e A327734 Case n=7: There are 7 necklace structures using exactly two colors. See example in A056295. Of these, 5 are achiral and the other two a chiral pair: AAABABB/AAABBAB. a(7) = 1, since this sequence considers chiral pairs as the same bracelet structure. %Y A327734 Column k=2 of A324802. %Y A327734 Cf. A056295, A056357. %K A327734 nonn,more %O A327734 1,8 %A A327734 _Andrew Howroyd_, Sep 23 2019