Conjunctive Normal Form (CNF) is a conjunction of disjunctions. k-CNF limits each disjunctive clause to k variables and their complements.
Table of n, a(n) for n=2..5.
C. B. Barber, ttcnf 2005.1 (April 2005).
C. B. Barber, www.qhull.org/ttcnf.
E.g. The 1-CNF expressions of 2 variables are: a, -a, b, -b, a and b, a and -b, -a and b, -a and -b, a and -a, true. Their truth tables are: 0xC, 0x3, 0xA, 0x5, 0x8, 0x4, 0x2, 0x1, 0x0, 0xF.
Cf. A109457, A112535.
Sequence in context: A272499 A054688 A229228 * A006295 A006297 A279292
Adjacent sequences: A112647 A112648 A112649 * A112651 A112652 A112653
Brad Barber (bradb(AT)shore.net), Dec 27 2005