This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
a(5) = 4 because 5 maps to "five" maps to "fIVe" maps to "IV" maps to 4. a(6) = 9 because 6 maps to "six" maps to "sIX" maps to "IX" maps to 9. a(7) = 5 because 7 maps to "seven" maps to "seVen" maps to "V" maps to 5. a(8) = 1 because 8 maps to "eight" maps to "eIght" maps to "I" maps to 1. a(9) = 1 because 9 maps to "nine" maps to "nIne" maps to "I" maps to 1. a(35) = 0 because 35 maps to "thirty-five" maps to "thIrty-fIVe" maps to "IIV" which is not a well-formed Roman nhumeral, hence maps to 0. a(1000) = 500 because 1000 maps to "one thousand" maps to "one thousanD" maps to "D" maps to 500.
a(1) = 500, which is fIVe hunDreD, so a(2) = concat(1, 5, 500, 500) = 15500500, which is fIVeteen MILLIon fIVe hunDreD thousanD fIVe hunDreD, so a(3) = concat(1, 5, 1000, 1, 50, 50, 1, 1, 5, 500, 500, 500, 1, 5, 500, 500), etc.
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