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 | 12345 |
| 2 | 23456 |
| 3 | 34567 |
| 4 | 45678 |
| 5 | 56789 |
| 6 | 678910 |
| 7 | 7891011 |
| 8 | 89101112 |
| 9 | 910111213 |
| 10 | 1011121314 |
| 11 | 1112131415 |
| 12 | 1213141516 |
| 13 | 1314151617 |
| 14 | 1415161718 |
| 15 | 1516171819 |
| 16 | 1617181920 |
| 17 | 1718192021 |
| 18 | 1819202122 |
| 19 | 1920212223 |
| 20 | 2021222324 |
| 21 | 2122232425 |
| 22 | 2223242526 |
| 23 | 2324252627 |
| 24 | 2425262728 |
| 25 | 2526272829 |