[seqfan] Re: Mystery concerning sequences A169720-A169727

[D. S. McNeil]

> But how are the sequences obtained from the drawings?

A169720 seems to count the number of contained shapes from the inside out:

1 = 1 central hexagon
10 = 1 hexagon + 6 small triangles + 3 triangles containing the central hexagon
55 = 10 + 12 white triangles/hexagons + (3 tri + 1 hex) * 6 inside the
green/blue triangles + 6 green/blue triangles + 3 large triangles
containing the white hexagon = 22+24+9=55

etc.


Doug