how many rooted and unrooted tree can be formed from four different sequences
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Number of unrooted trees for n taxa Nu=(2n-5)*(2n-7)*. ... the number of unrooted trees for n sequences is equal for the number of rooted trees for (n-1) sequences. ... 4. 3. 15. 5. 15. 105. 6. 105. 945. 7. 945. 10395. 8. 10395. 135135. 9. 135135.
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