It is a series of 148 trapeziums in accordance with the following pattern :
can be 0, 1,
, 2,
+1, 3, 2
,
+2, 4, 2
+1,
+3, 3
, 5, 2
+2,
+4, 3
+1, 6, 2
+3, 4
,
+5, 3
+2, 7, 2
+4, 4
+1,
+6, 3
+3, 8, 5
, 2
+5, 4
+2,
+7, 3
+4, 9, 5
+1, 2
+6, 4
+3,
+8, 6
, 3
+5, 10, 5
+2, 2
+7, 4
+4,
+9, 6
+1, 3
+6, 11, 5
+3, 2
+8, 7
, 4
+5,
+10, 6
+2, 3
+7, 12, 5
+4, 2
+9, 7
+1, 4
+6,
+11, 6
+3, 3
+8, 8
, 13, 5
+5, 2
+10, 7
+2, 4
+7,
+12, 6
+4, 3
+9, 8
+1, 14, 5
+6, 2
+11, 7
+3, 4
+8, 9
,
+13, 6
+5, 3
+10, 8
+2, 15, 5
+7, 2
+12, 7
+4, 4
+9, 9
+1,
+14, 6
+6, 3
+11, 8
+3, 16, 5
+8, 10
, 2
+13, 7
+5, 4
+10, 9
+2,
+15, 6
+7, 3
+12, 8
+4, 17, 5
+9, 10
+1, 2
+14, 7
+6, 4
+11, 9
+3,
+16, 6
+8, 3
+13, 8
+5, 18, 5
+10, 10
+2, 2
+15, 7
+7, 4
+12, 9
+4,
+17, 6
+9, 3
+14, 8
+6, 19, 5
+11, 10
+3, 2
+16, 7
+8, 4
+13, 9
+5,
+18, 6
+10, 3
+15, 8
+7, 20, 5
+12, 10
+4, 2
+17, 7
+9, 4
+14, 9
+6,
+19, 6
+11, 3
+16, 8
+8 or 21.
Examples :
=
0
=
=
2
+3
Trapezoj
Bonvenon