Not logical I tried several viable solutions before giving up!

Little help with this please?

Here is the first five rows, I hope it helps.
R1 C4-7, 12-14, 17-19
R2 C3, 8-9, 13, 16, 20
R3 C2, 9-11, 15, 21
R4 C2, 10-13, 15, 19, 21
R5 C1-2, 10-14, 18-19, 21.

Thank you! It really helped :)