You only need to encode ampersands in URL when they appear in HTML. In the address bar or in a non-html context (e.g. when calling from within CURL or PHP), you don't need them, and in fact they will break the URLs. Your browser will automatically decode the URLs into the correct format to make the actual request. This is true of all URLs in HTML, it's nothing specific to google charts. To prove this, embed your image URL using encoded ampersands, then select 'open image in new window' from a contextual menu and you'll see the decoded URL in the address bar.
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