The following is from this web site:
* What is the Cambridge Reference Sequence (CRS)?
* This is the mitochondrial DNA (mtDNA) sequence against which we compare all of the mtDNA sequences generated for our customers. It was determined by a group of researchers in Cambridge (hence the name) as being the most common sequence found in native Europeans. If your sequence is the same as the CRS, then you are in the clan of Helena. The 400 base pairs of the CRS that we analyse is shown below:
ATTCTAATTT AAACTATTCT CTGTTCTTTC ATGGGGAAGC AGATTTGGGT
ACCACCCAAG TATTGACTCA CCCATCAACA ACCGCTATGT ATTTCGTACA
TTACTGCCAG CCACCATGAA TATTGTACGG TACCATAAAT ACTTGACCAC
CTGTAGTACA TAAAAACCCA ATCCACATCA AAACCCCCTC CCCATGCTTA
CAAGCAAGTA CAGCAATCAA CCCTCAACTA TCACACATCA ACTGCAACTC
CAAAGCCACC CCTCACCCAC TAGGATACCA ACAAACCTAC CCACCCTTAA
CAGTACATAG TACATAAAGC CATTTACCGT ACATAGCACA TTACAGTCAA
ATCCCTTCTC GTCCCCATGG ATGACCCCCC TCAGATAGGG GTCCCTTGAC
There is nothing special about the CRS, it just happens to be the one they started with and everything else is compared against it. The numbers/letters you listed are not your full sequence, but represent where your sequence is different from the CRS. "Layla's Clan" is not a specific group of people, but is made up of people with the same differences that you have from the CRS wherever they may be.