OFFSET
1,7
REFERENCES
F. Harary and E. M. Palmer, Graphical Enumeration, Academic Press, NY, 1973.
EXAMPLE
0;
1;
1,1,1;
1,2,4,4,2,1;
1,2,6,12,16,16,12,6,2,1;
1,2,7,18,40,68,96,108,96,68,40,18,7,2,1;
CROSSREFS
KEYWORD
nonn,tabf
AUTHOR
Vladeta Jovovic, Mar 07 2007
STATUS
approved