

A290653


Number of perfect dissections of equilateral triangles into n equilateral triangles with integer sides.


4




OFFSET

15,1


COMMENTS

A perfect dissection has no two triangles of the same side. Triangles of different orientation are counted separately. The computation by A. Drapal and C. Hamalainen proves Tutte's conjecture that the smallest perfect dissection has size 15.


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KEYWORD

nonn,more,hard


AUTHOR



STATUS

approved



