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 | 3 |
| 2 | 23 |
| 3 | 23 |
| 4 | 85 |
| 5 | 177 |
| 6 | 431 |
| 7 | 876 |
| 8 | 2137 |
| 9 | 5002 |
| 10 | 11687 |
| 11 | 27591 |
| 12 | 64253 |
| 13 | 150967 |
| 14 | 353682 |
| 15 | 830580 |
| 16 | 1954490 |
| 17 | 4575013 |
| 18 | 10742553 |
| 19 | 25221766 |
| 20 | 59150366 |
| 21 | 138829820 |
| 22 | 325959550 |
| 23 | 764905062 |
| 24 | 1795278490 |
| 25 | 4214144288 |
| 26 | 9890202526 |
| 27 | 23212413440 |
| 28 | 54483362577 |