id:A056455 - OEIS Search Results

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Palindromes using exactly four different symbols.

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0, 0, 0, 0, 0, 0, 24, 24, 240, 240, 1560, 1560, 8400, 8400, 40824, 40824, 186480, 186480, 818520, 818520, 3498000, 3498000, 14676024, 14676024, 60780720, 60780720, 249401880, 249401880, 1016542800, 1016542800 (list; graph; listen)

	OFFSET	`1,7`
	REFERENCES	`M. R. Nester (1999). Mathematical investigations of some plant interaction designs. PhD Thesis. University of Queensland, Brisbane, Australia.`
	FORMULA	`4! * stirling2( [(n+1)/2], 4).`
	CROSSREFS	`Cf. A056450, A000919.` `Adjacent sequences: A056452 A056453 A056454 this_sequence A056456 A056457 A056458` `Sequence in context: A103640 A004011 A056465 this_sequence A128378 A004513 A004465`
	KEYWORD	`nonn`
	AUTHOR	`Marks R. Nester (nesterm(AT)dpi.qld.gov.au)`

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Last modified October 12 15:26 EDT 2008. Contains 144830 sequences.

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