6,2
CRC Handbook of Combinatorial Designs, 1996, p. 649.
Table of n, a(n) for n=6..13.
Sequence in context: A166154 A034507 A211620 * A139267 A254855 A181340
Adjacent sequences: A023635 A023636 A023637 * A023639 A023640 A023641
nonn
N. J. A. Sloane.
approved