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 | 1 |
| 2 | 2 |
| 3 | 3 |
| 4 | 4 |
| 5 | 5 |
| 6 | 6 |
| 7 | 7 |
| 8 | 8 |
| 9 | 9 |
| 10 | 45 |
| 11 | 566 |
| 12 | 1500 |
| 13 | 2250 |
| 14 | 3750 |
| 15 | 18000 |
| 16 | 383333 |
| 17 | 4428571 |
| 18 | 11250000 |
| 19 | 788888888 |
| 20 | 1000000000 |
| 21 | 2000000000 |
| 22 | 3000000000 |
| 23 | 4000000000 |
| 24 | 5000000000 |
| 25 | 6000000000 |
| 26 | 7000000000 |
| 27 | 8000000000 |
| 28 | 9000000000 |
| 29 | 44545454545 |
| 30 | 358333333333 |
| 31 | 4461538461538 |