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 | 641 |
| 2 | 1213 |
| 3 | 2617 |
| 4 | 2957 |
| 5 | 3727 |
| 6 | 5443 |
| 7 | 9283 |
| 8 | 17359 |
| 9 | 33829 |
| 10 | 66173 |
| 11 | 131303 |
| 12 | 264763 |
| 13 | 494743 |
| 14 | 957547 |
| 15 | 1888157 |
| 16 | 3753647 |
| 17 | 7490797 |
| 18 | 14961157 |
| 19 | 29899357 |
| 20 | 59773871 |
| 21 | 119551489 |
| 22 | 239106347 |
| 23 | 478234723 |
| 24 | 956607929 |
| 25 | 1913366111 |
| 26 | 3826828409 |
| 27 | 7653840367 |
| 28 | 15308666783 |
| 29 | 30619196381 |
| 30 | 57415599151 |