A056453 - OEIS

This site is supported by donations to The OEIS Foundation.

A056453

Palindromes using exactly two different symbols.

0, 0, 2, 2, 6, 6, 14, 14, 30, 30, 62, 62, 126, 126, 254, 254, 510, 510, 1022, 1022, 2046, 2046, 4094, 4094, 8190, 8190, 16382, 16382, 32766, 32766, 65534, 65534, 131070, 131070, 262142, 262142, 524286, 524286, 1048574, 1048574 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,3`
	REFERENCES	`M. R. Nester (1999). Mathematical investigations of some plant interaction designs. PhD Thesis. University of Queensland, Brisbane, Australia.`
	LINKS	`Vincenzo Librandi, Table of n, a(n) for n = 1..2000`
	FORMULA	`a(n) = 2^floor((n+1)/2) - 2.`
	PROG	`(MAGMA) [2^Floor((n+1)/2)-2: n in [1..40]]; // Vincenzo Librandi, Aug 16 2011`
	CROSSREFS	`Cf. A016116, A000918.` `Sequence in context: A060549 A120690 A165124 * A034422 A140833 A071908` `Adjacent sequences: A056450 A056451 A056452 * A056454 A056455 A056456`
	KEYWORD	`nonn,easy`
	AUTHOR	`Marks R. Nester (nesterm(AT)dpi.qld.gov.au)`
	EXTENSIONS	`More terms from Vincenzo Librandi, Aug 16 2011`

Content is available under The OEIS End-User License Agreement .

Last modified February 15 21:56 EST 2012. Contains 205860 sequences.