Table 1 The first ten values of ${\mathbf{\sum }}_{\mathbf{(}\mathit{a}\mathbf{+}\mathit{b}\mathbf{+}\mathit{c}\mathbf{)}\mathit{x}\mathbf{=}\mathit{n}}\mathit{a}$

${\sum }_{(a+b+c)x=n}a$

0

0

1

4

10

21

35

60

85

130