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 | 5 |
| 3 | 11 |
| 4 | 35 |
| 5 | 71 |
| 6 | 215 |
| 7 | 431 |
| 8 | 1295 |
| 9 | 2591 |
| 10 | 7775 |
| 11 | 15551 |
| 12 | 46655 |
| 13 | 93311 |
| 14 | 279935 |
| 15 | 559871 |
| 16 | 1679615 |
| 17 | 3359231 |
| 18 | 10077695 |
| 19 | 20155391 |
| 20 | 60466175 |
| 21 | 120932351 |
| 22 | 362797055 |
| 23 | 725594111 |
| 24 | 2176782335 |
| 25 | 4353564671 |
| 26 | 13060694015 |
| 27 | 26121388031 |
| 28 | 78364164095 |