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A056339
Number of primitive (aperiodic) reversible string structures with n beads using exactly five different colors.
1
0, 0, 0, 0, 1, 9, 76, 542, 3523, 21392, 123680, 690541, 3756151, 20042513, 105394295, 548123440, 2826435403, 14479201301, 73794961960, 374603863517, 1895632969275, 9568915248589, 48208452866816
OFFSET
1,6
COMMENTS
A string and its reverse are considered to be equivalent. Permuting the colors will not change the structure.
REFERENCES
M. R. Nester (1999). Mathematical investigations of some plant interaction designs. PhD Thesis. University of Queensland, Brisbane, Australia. [See A056391 for pdf file of Chap. 2]
FORMULA
CROSSREFS
Column 5 of A276544.
Cf. A056321.
Sequence in context: A274657 A255931 A319957 * A056329 A190982 A082677
KEYWORD
nonn
STATUS
approved