OFFSET
1,1
COMMENTS
For n > 1, a(n) is a nonzero multiple of 4*(n!)^2. - Bert Dobbelaere, Sep 30 2020
LINKS
Eric Weisstein's World of Mathematics, Complete Bipartite Graph
Eric Weisstein's World of Mathematics, Graceful Labeling
FORMULA
a(n) = 4*(n!)^2 A335619(n) for n > 1.
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Eric W. Weisstein, Sep 22 2020
EXTENSIONS
a(5)-a(9) from Bert Dobbelaere, Sep 30 2020
a(10)-a(15) (using terms in A335619) from Alois P. Heinz, Dec 08 2020
STATUS
approved