C# (Visual C# Interactive Compiler), 65 bytes

for(int i=0;i<7;i++){WriteLine(new string("conemon"[i],i*2+10));}

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new string(char, int) repeats the char as often as the int value.

C#, 73 bytes without "Console" as static using (example outside interactive compiler):

for(int i=0;i<7;i++){Console.WriteLine(new string("conemon"[i],i*2+10));}

C# (Visual C# Interactive Compiler) 65 64 bytes

for(int i=0;i<7;){WriteLine(new string("conemon"[i],i++*2+10));}

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thanks to @Jonathan Frech saving 1 byte

new string(char, int) repeats the char as often as the int value.

C#, 72 bytes without "Console" as static using (example outside interactive compiler):

for(int i=0;i<7;){Console.WriteLine(new string("conemon"[i],i++*2+10));}