1,2

Motzkin, T. "Relations Between Hypersurface Cross Ratios and a Combinatorial Formula for Partitions of a Polygon for Permanent Preponderance and for Non-Associative Products." Bull. Amer. Math. Soc. 54, page 360, 1948.

Table of n, a(n) for n=1..6.

L. Smiley, a(5)

See A111275 for the correct enumeration.

Sequence in context: A095064 A323144 A056353 * A133385 A002076 A286435

Adjacent sequences: A111271 A111272 A111273 * A111275 A111276 A111277

dead

a(5)=9 is clearly a clerical error.

approved