Aronson's sequence is defined by the English sentence: "t is the first, fourth, eleventh, ... letter of this sentence." The first few values, obtained by counting
letters and ignoring spaces and punctuation, are 1, 4, 11, 16, 24, 29, 33, 35, 39,
... (OEIS A005224).
The terms are written as English ordinal names. The spelling convention omits "and," for example "one hundred fourth." Different spelling conventions can change
later terms (Cloitre et al. 2003).
