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A056476 Number of primitive (aperiodic) palindromic structures using a maximum of two different symbols. 4
1, 0, 1, 1, 3, 2, 7, 6, 14, 12, 31, 27, 63, 56, 123, 120, 255, 238, 511, 495, 1015, 992, 2047, 2010, 4092, 4032, 8176, 8127, 16383, 16242, 32767 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,5

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]

LINKS

Table of n, a(n) for n=1..31.

FORMULA

Sum mu(d)*A016116(n/d-1) where d|n.

CROSSREFS

Cf. A056458.

Sequence in context: A125718 A268821 A014841 * A056481 A269386 A252756

Adjacent sequences:  A056473 A056474 A056475 * A056477 A056478 A056479

KEYWORD

nonn

AUTHOR

Marks R. Nester

STATUS

approved

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Last modified April 6 18:51 EDT 2020. Contains 333286 sequences. (Running on oeis4.)