1 (0+1)
3 (0+1+2)
6 (0+1+2+3)
10 (0+1+2+3+4)
15 (0+1+2+3+4+5)
21 (0+1+2+3+4+5+6)
Notice these are the numbers you can arrange into equalateral triangles.
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58524600--753 that is it and it right
The first six cube numbers are equal to 1, 2, 3, 4, 5 and 6 cubed. Then these numbers are 1, 8, 27, 64, 125 and 216.
1,2,3,4,5,15
HEXAD or sextuple or a sextet
The numbers are 14, 16 and 18.