[R] Convolution vector to be derived

[Moohwan Kim]

I want to generate the following outcome using convolution of two sequences.

x <- c(1,2,3,4,5)
y <- c(6,7,8,9)

The resulting convolution vector is
6
19
40
70
100
94
76
45
When using convolve(), it is hard to produce the result above.
Would you help me out to get that?

Best regards
Moohwan Kim