A056485 Number of primitive (aperiodic) palindromic structures using exactly six different symbols.

0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 21, 21, 266, 266, 2646, 2646, 22827, 22827, 179487, 179486, 1323652, 1323651, 9321312, 9321291, 63436373, 63436352, 420693273, 420693007, 2734926558

Offset: 1

Author

Marks R. Nester

Keywords

• nonn

Comments

Permuting the symbols 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]

Crossrefs

Column 6 of A284826.

Cf. A056467.

Formula

A056480(n)-A056479(n).