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A170947 Number of refexible maps with n edges. 1
2, 5, 20, 85, 418, 2242, 12828, 77777, 493286, 3260485, 22314484, 157735801, 1147285362, 8570960234, 65611620808, 513963377327, 4113363020482, 33598074760393, 279764563749076, 2372822051513583, 20481425601917742 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Antonio Breda d'Azevedo, Alexander Mednykh and Roman Nedela, Table of n, a(n) for n = 1..30

Antonio Breda d'Azevedo, Alexander Mednykh and Roman Nedela, Enumeration of maps regardless of genus: Geometric approach, Discrete Mathematics, Volume 310, 2010, Pages 1184-1203.

CROSSREFS

Cf. A170948, A170949.

Sequence in context: A286285 A192101 A012768 * A006228 A190656 A262166

Adjacent sequences:  A170944 A170945 A170946 * A170948 A170949 A170950

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Feb 21 2010

STATUS

approved

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Last modified January 17 10:59 EST 2019. Contains 319218 sequences. (Running on oeis4.)