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 | 1 |
| 3 | 4 |
| 4 | 10 |
| 5 | 34 |
| 6 | 110 |
| 7 | 388 |
| 8 | 1369 |
| 9 | 4982 |
| 10 | 18246 |
| 11 | 67727 |
| 12 | 253014 |
| 13 | 952275 |
| 14 | 3602743 |
| 15 | 13698525 |
| 16 | 52297602 |
| 17 | 200402285 |
| 18 | 770414503 |
| 19 | 2970385477 |
| 20 | 11482405741 |
| 21 | 44491816601 |
| 22 | 172766346508 |
| 23 | 672186393972 |
| 24 | 2619994613794 |
| 25 | 10228901862928 |
| 26 | 39996339056273 |
| 27 | 156612019296546 |
| 28 | 614044339256951 |