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A056482
Number of primitive (aperiodic) palindromic structures using exactly three different symbols.
2
0, 0, 0, 0, 1, 1, 6, 6, 25, 24, 90, 89, 301, 295, 965, 960, 3025, 2999, 9330, 9305, 28495, 28411, 86526, 86430, 261624, 261324, 788945, 788669, 2375101, 2374110, 7141686
OFFSET
1,7
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]
FORMULA
CROSSREFS
Column 3 of A284826.
Cf. A056464.
Sequence in context: A219910 A334569 A077193 * A255466 A286482 A123874
KEYWORD
nonn
STATUS
approved