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A056503 Number of periodic palindromic structures of length n using a maximum of two different symbols. 5
1, 2, 2, 4, 4, 7, 8, 14, 16, 26, 32, 51, 64, 100, 128, 198, 256, 392, 512, 778, 1024, 1552, 2048, 3091, 4096, 6176, 8192, 12324, 16384, 24640, 32768, 49222, 65536, 98432, 131072, 196744, 262144, 393472, 524288, 786698, 1048576, 1573376, 2097152, 3146256, 4194304 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

For example, aaabbb is not a (finite) palindrome but it is a periodic palindrome. 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..45.

FORMULA

No formula known - terms found by computer search.

CROSSREFS

Cf. A016116, A285012.

Sequence in context: A222738 A005308 A151532 * A256217 A055636 A206559

Adjacent sequences:  A056500 A056501 A056502 * A056504 A056505 A056506

KEYWORD

nonn

AUTHOR

Marks R. Nester (nesterm(AT)dpi.qld.gov.au)

EXTENSIONS

a(17)-a(45) from Andrew Howroyd, Apr 07 2017

STATUS

approved

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Last modified June 29 10:01 EDT 2017. Contains 288859 sequences.