OFFSET
0,2
LINKS
D. Merlini, R. Sprugnoli, and M. C. Verri, The tennis ball problem, J. Combin. Theory, A 99 (2002), 307-344 (S_n for s=4).
FORMULA
a(n) is asymptotic to c*sqrt(n)*(256/27)^n with c=2.8... - Benoit Cloitre, Jan 26 2003
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Jan 19 2003
STATUS
approved