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#JavaScript (ES6), 74 bytes

Returns a list of non-wrapping integers.

n=>(g=(u,v=1)=>n?(n--,u)&-u^v?g(u,v*2):g(u+1,1):v?[u-v,...g(u,v-1)]:[])(1)

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#JavaScript (ES6), 110 bytes

Returns wrapping uppercase letters.

n=>(g=(u,v=1,s=i='')=>(s+=String.fromCharCode(65+i++%26),n--)?u&-u^v?g(u,v*2,s):g(u+1,1,s):s.substr(u-v,v))(1)

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Or 104 bytes if lowercase is acceptable.

Based upon a construction by Donald Knuth. Related OEIS entry: A182105.