login
A378074
Number of embeddings on the sphere of 2-connected homeomorphically irreducible planar graphs with n nodes.
1
0, 0, 0, 1, 2, 9, 47, 420, 4673, 63253, 927238, 14342093, 229607392, 3776227106, 63482545872, 1087322656758, 18927037827561
OFFSET
1,5
COMMENTS
Homeomorphically irreducible means each vertex has a degree of at least 3.
FORMULA
a(n) = A000944(n) + A187927(n).
CROSSREFS
Row sums of A378075.
Sequence in context: A059272 A379434 A228341 * A289576 A370200 A369315
KEYWORD
nonn,more
AUTHOR
Andrew Howroyd, Nov 15 2024
STATUS
approved