13,3
CRC Handbook of Combinatorial Designs, 1996, p. 649.
Table of n, a(n) for n=13..26.
Sequence in context: A323173 A324184 A114691 * A291534 A331733 A301755
Adjacent sequences: A023636 A023637 A023638 * A023640 A023641 A023642
nonn
N. J. A. Sloane.
approved