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A056483
Number of primitive (aperiodic) palindromic structures using exactly four different symbols.
2
0, 0, 0, 0, 0, 0, 1, 1, 10, 10, 65, 65, 350, 349, 1701, 1700, 7770, 7760, 34105, 34095, 145749, 145685, 611501, 611435, 2532530, 2532180, 10391735, 10391395, 42355950, 42354239, 171798901
OFFSET
1,9
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 4 of A284826.
Cf. A056465.
Sequence in context: A106789 A270012 A219911 * A056473 A241869 A243126
KEYWORD
nonn
STATUS
approved