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) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 5 |
| 3 | 14 |
| 4 | 39 |
| 5 | 106 |
| 6 | 283 |
| 7 | 748 |
| 8 | 1967 |
| 9 | 5160 |
| 10 | 13521 |
| 11 | 35412 |
| 12 | 92725 |
| 13 | 242774 |
| 14 | 635609 |
| 15 | 1664066 |
| 16 | 4356603 |
| 17 | 11405758 |
| 18 | 29860687 |
| 19 | 78176320 |
| 20 | 204668291 |
| 21 | 535828572 |
| 22 | 1402817445 |
| 23 | 3672623784 |
| 24 | 9615053929 |
| 25 | 25172538026 |
| 26 | 65902560173 |
| 27 | 172535142518 |