Original entry on oeis.org
0, 0, 0, 3, 0, 0, 0, 6, 6
Offset: 1
Original entry on oeis.org
0, 0, 0, 0, 1, 1, 1, 1, 3, 5
Offset: 0
A161828
Number of rhombuses in the Y-toothpick structure of A160120 after n rounds.
Original entry on oeis.org
0, 0, 3, 3, 9, 9, 15, 21, 33, 39
Offset: 0
A161418
Number of triangles in the Y-toothpick structure after n rounds.
Original entry on oeis.org
0, 0, 0, 0, 6, 6, 12, 12, 24, 30
Offset: 0
A194278
Total number of polygons after n-th stage in the D-toothpick structure of A194270.
Original entry on oeis.org
0, 0, 0, 0, 2, 8, 14, 16, 26, 38, 46, 48, 56, 72, 102
Offset: 0
Consider the structure with toothpicks of length 2 and D-toothpicks of length sqrt(2). After 3 stages the number of polygons in the structure is equal to 0. After 4 stages there are 2 hexagons, each with area = 6, so a(4) = 2. After 5 stages there are new 6 polygons: 2 hexagons, each with area = 8 and also 2 octagons, each with area = 14, so a(5) = 2+6 = 8.
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