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 | 5 |
| 3 | 13 |
| 4 | 31 |
| 5 | 73 |
| 6 | 173 |
| 7 | 409 |
| 8 | 967 |
| 9 | 2283 |
| 10 | 5392 |
| 11 | 12735 |
| 12 | 30073 |
| 13 | 71017 |
| 14 | 167706 |
| 15 | 396032 |
| 16 | 935217 |
| 17 | 2208486 |
| 18 | 5215270 |
| 19 | 12315692 |
| 20 | 29083113 |
| 21 | 68678837 |
| 22 | 162182870 |
| 23 | 382989640 |
| 24 | 904417737 |
| 25 | 2135753445 |
| 26 | 5043513182 |
| 27 | 11910094433 |
| 28 | 28125305569 |
| 29 | 66417005997 |