OFFSET
0,12
COMMENTS
The Euler transformation currently does nothing: for n < 18, a(n) = A014378(n).
LINKS
Eric Weisstein's World of Mathematics, Octic Graph
FORMULA
Euler transformation of A014378.
EXAMPLE
The a(0)=1 graph is K_0 (vacuously 8-regular).
The a(9)=1 graph is K_9.
MATHEMATICA
(* EulerTransform is defined in A005195 *)
EulerTransform[Rest @ A014378] (* Jean-François Alcover, Dec 04 2019, updated Mar 18 2020 *)
CROSSREFS
8-regular simple graphs: A014378 (connected), A165878 (disconnected), this sequence (not necessarily connected).
Not necessarily connected regular simple graphs: A005176 (any degree), A051031 (triangular array), specified degree k: A000012 (k=0), A000012 (k=1), A008483 (k=2), A005638 (k=3), A033301 (k=4), A165626 (k=5), A165627 (k=6), A165628 (k=7), this sequence (k=8).
KEYWORD
nonn,hard
AUTHOR
Jason Kimberley, Jan 17 2011
EXTENSIONS
a(17)-a(22) from Andrew Howroyd, Mar 08 2020
STATUS
approved