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A234278
The number of circular maps C(n) with n edges regardless of genus.
1
1, 2, 5, 16, 56, 333, 2147, 17456, 158022, 1604281, 17863089, 216774585, 2844162968, 40129498111, 605894465441, 9748493596584, 166520626541070, 3009885559478844, 57397289146583917, 1151666341035710396
OFFSET
1,2
COMMENTS
The circular maps are also the maps whose faces could be colored in two colors.
LINKS
FORMULA
See formula for C(n) in Theorem 2.1 of Deryagina and Mednykh (2013).
CROSSREFS
Sequence in context: A195931 A350906 A082789 * A180678 A072110 A323229
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Dec 28 2013, based on email from Madina Deryagina and Alexander Mednykh.
STATUS
approved