id:A054935 - OEIS Search Results

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Number of planar maps with n edges up to orientation-preserving duality.

+0
1

1, 3, 7, 33, 156, 1070, 7515, 59151, 483925, 4136964, 36416865, 329048627, 3037029030, 28553451498, 272766018806, 2642420298576, 25916954091582, 257009789443925 (list; graph; listen)

	OFFSET	`1,2`
	LINKS	`V. A. Liskovets, Some easily derivable sequences, J. Integer Sequences, 3 (2000), #00.2.2.`
	FORMULA	`Average of A006384 and A006849 (the latter interspersed with 0's).`
	CROSSREFS	`Adjacent sequences: A054932 A054933 A054934 this_sequence A054936 A054937 A054938` `Sequence in context: A057480 A051256 A057795 this_sequence A024496 A081890 A047907`
	KEYWORD	`nonn,easy,more`
	AUTHOR	`njas, May 24 2000`
	EXTENSIONS	`More terms from Valery A. Liskovets (liskov(AT)im.bas-net.by), May 27 2006`

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Last modified October 10 20:39 EDT 2008. Contains 144831 sequences.

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