A054938 - OEIS

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A054938

Number of chiral chord diagrams on n nodes.

0, 0, 0, 1, 26, 348, 4466, 61726, 949795, 16331482, 312298796, 6587217199, 152030203190, 3811719561156, 103171205826822, 2998417379370294, 93127344062857976, 3078376281077418971, 107905190923235526392 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,5`
	LINKS	`V. A. Liskovets, Some easily derivable sequences, J. Integer Sequences, 3 (2000), #00.2.2.`
	FORMULA	`a(n) = A054499(n)-A018191(n). [Liskovets, referring to offset 1 in A054499]. - R. J. Mathar, Oct 01 2011`
	CROSSREFS	`Sequence in context: A035708 A042306 A053494 * A161526 A161933 A162368` `Adjacent sequences: A054935 A054936 A054937 * A054939 A054940 A054941`
	KEYWORD	`nonn,easy`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com), May 24 2000`

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Last modified February 16 09:27 EST 2012. Contains 205904 sequences.