7,3
CRC Handbook of Combinatorial Designs, 1996, p. 649.
Table of n, a(n) for n=7..31.
Column k=6 of A319367.
Sequence in context: A013117 A120864 A173463 * A083775 A083784 A177048
Adjacent sequences: A023638 A023639 A023640 * A023642 A023643 A023644
nonn
N. J. A. Sloane
a(27)-a(31) added by Andrew Howroyd, Sep 18 2018
approved