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.
| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 2 |
| 4 | 3 |
| 5 | 4 |
| 6 | 5 |
| 7 | 6 |
| 8 | 7 |
| 9 | 8 |
| 10 | 9 |
| 11 | 101 |
| 12 | 212 |
| 13 | 323 |
| 14 | 434 |
| 15 | 545 |
| 16 | 656 |
| 17 | 767 |
| 18 | 878 |
| 19 | 989 |
| 20 | 21012 |
| 21 | 32123 |
| 22 | 43234 |
| 23 | 54345 |
| 24 | 65456 |
| 25 | 76567 |
| 26 | 87678 |
| 27 | 98789 |
| 28 | 3210123 |
| 29 | 4321234 |
| 30 | 5432345 |
| 31 | 6543456 |
| 32 | 7654567 |
| 33 | 8765678 |
| 34 | 9876789 |
| 35 | 432101234 |
| 36 | 543212345 |
| 37 | 654323456 |
| 38 | 765434567 |
| 39 | 876545678 |
| 40 | 987656789 |
| 41 | 54321012345 |
| 42 | 65432123456 |
| 43 | 76543234567 |
| 44 | 87654345678 |
| 45 | 98765456789 |
| 46 | 6543210123456 |
| 47 | 7654321234567 |
| 48 | 8765432345678 |
| 49 | 9876543456789 |
| 50 | 765432101234567 |
| 51 | 876543212345678 |
| 52 | 987654323456789 |
| 53 | 87654321012345678 |
| 54 | 98765432123456789 |
| 55 | 9876543210123456789 |