I didn't realize you also wanted the intermediate results. The others have
provided you answers; but for future reference and exploration: J provides you
many tools.
Here's an (ugly) answer using ^: :
ug =. 2 : '[: >@:({."1) (2&(u&.>/@:{. , }.)^:(1 < #)^:n @: (;
<"_1@:|.)~)'
L =. 2 4 6 8 10
R =. i. 2 2
L + ug _ R NB. Just final result
30 31
32 33
L + ug a: R NB. Intermediate results
0 1
2 3
10 11
12 13
18 19
20 21
24 25
26 27
28 29
30 31
30 31
32 33
-Dan
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