OFFSET
-1,2
REFERENCES
J. A. Thas, Old and new results on spreads and ovoids of finite classical polar spaces, pp. 529-544 of A. Barlotti et al., eds., Combinatorics `90, North-Holland 1992.
MATHEMATICA
Table[Product[3^(2k+1)+1, {k, 0, n}], {n, -1, 10}] (* Harvey P. Dale, May 09 2015 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Jul 03 2003
STATUS
approved