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 | 2 |
| 2 | 3 |
| 3 | 4 |
| 4 | 5 |
| 5 | 6 |
| 6 | 7 |
| 7 | 8 |
| 8 | 9 |
| 9 | 1 |
| 10 | 110 |
| 11 | 2100 |
| 12 | 31000 |
| 13 | 410000 |
| 14 | 5100000 |
| 15 | 61000000 |
| 16 | 710000000 |
| 17 | 8100000000 |
| 18 | 91000000000 |
| 19 | 20000000000 |
| 20 | 1200000000000 |
| 21 | 22000000000000 |
| 22 | 320000000000000 |
| 23 | 4200000000000000 |
| 24 | 52000000000000000 |
| 25 | 620000000000000000 |