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A056338 Number of primitive (aperiodic) reversible string structures with n beads using exactly four different colors. 1

%I

%S 0,0,0,1,6,37,183,876,3930,17179,73095,306323,1267266,5198374,

%T 21182337,85910040,347187210,1399447578,5629911015,22616239535,

%U 90754854843,363890053582,1458172596903,5840531328120,23385650196084

%N Number of primitive (aperiodic) reversible string structures with n beads using exactly four different colors.

%C A string and its reverse are considered to be equivalent. Permuting the colors will not change the structure.

%D 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]

%F A056333(n)-A056332(n).

%Y Column 4 of A276544.

%Y Cf. A056320.

%K nonn

%O 1,5

%A _Marks R. Nester_

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Last modified May 5 18:25 EDT 2021. Contains 343572 sequences. (Running on oeis4.)