3,10

CRC Handbook of Combinatorial Designs, 1996, p. 216.

Sequence in context: A077505 A031436 A144556 this_sequence A086313 A016451 A093097

Adjacent sequences: A001436 A001437 A001438 this_sequence A001440 A001441 A001442

nonn,hard

N. J. A. Sloane (njas(AT)research.att.com).

Probably an erroneous version of A031436.