For me it was here.
Or here... not sure which I saw first.
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Regardless it always has that 'Batman and' attached to the Robin name. I know he had a lot of solo silver age stuff zany adventures.. but I usually file those away with Batman in Zebra costumes and Superman shooting tiny Supermen out of his fingers... They're a fun slice of life, but I don't really contribute them as a 'core concept' to the character.
And again, that's just personal opinion. Which is what I think the whole Starfire vs Batgirl debate is all about. Of the drastically different types of Dick Grayson stories that have been written... which do you prefer? Ace acrobatic detective... or interstellar super hero?