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A234947 Number of different optimal triangle difference sets M(n,2). 2
1, 3, 12, 8, 21, 720, 4079, 3040, 20505, 1669221, 14708525, 10567748 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..12.

J. B. Shearer, Difference Triangle Sets: Known optimal solutions.

J. B. Shearer, Difference Triangle Sets: Discoverers

CROSSREFS

A row of array in A234944. Cf. A234943.

Sequence in context: A175046 A093855 A013188 * A051353 A070706 A239932

Adjacent sequences:  A234944 A234945 A234946 * A234948 A234949 A234950

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Jan 08 2014

STATUS

approved

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Last modified March 25 03:50 EDT 2019. Contains 321450 sequences. (Running on oeis4.)