id:A056490 - OEIS Search Results

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Number of periodic palindromes using exactly four different symbols.

+0
2

0, 0, 0, 0, 0, 12, 24, 132, 240, 900, 1560, 4980, 8400, 24612, 40824, 113652, 186480, 502500, 818520, 2158260, 3498000, 9087012, 14676024, 37728372, 60780720, 155091300, 249401880, 632972340, 1016542800 (list; graph; listen)

	OFFSET	`1,6`
	REFERENCES	`M. R. Nester (1999). Mathematical investigations of some plant interaction designs. PhD Thesis. University of Queensland, Brisbane, Australia.`
	FORMULA	`2*A056344(n)-A056284(n).`
	EXAMPLE	`For example, aaabbb is not a (finite) palindrome but it is a periodic palindrome.`
	CROSSREFS	`Cf. A056455.` `Adjacent sequences: A056487 A056488 A056489 this_sequence A056491 A056492 A056493` `Sequence in context: A109745 A051385 A056500 this_sequence A130163 A002167 A058994`
	KEYWORD	`nonn`
	AUTHOR	`Marks R. Nester (nesterm(AT)dpi.qld.gov.au)`

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Last modified October 13 20:18 EDT 2008. Contains 145016 sequences.

AT&T Labs Research