5,2
CRC Handbook of Combinatorial Designs, 1996, p. 649.
Table of n, a(n) for n=5..13.
Sequence in context: A125081 A175349 A281223 * A319672 A355233 A145387
Adjacent sequences: A023641 A023642 A023643 * A023645 A023646 A023647
nonn
N. J. A. Sloane.
approved