OFFSET
1,4
COMMENTS
Equivalently, number of 3-(4*n,2*n,n-1) designs.
REFERENCES
A. S. Hedayat, N. J. A. Sloane and J. Stufken, Orthogonal Arrays, Springer-Verlag, NY, 1999, see Table 7.37 page 165.
CROSSREFS
KEYWORD
nonn,nice,hard,more
AUTHOR
EXTENSIONS
a(7) computed by N. J. A. Sloane
a(8) from Brendan McKay, Feb 11 2012
STATUS
approved