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 | 5 |
| 2 | 19 |
| 3 | 61 |
| 4 | 146 |
| 5 | 336 |
| 6 | 757 |
| 7 | 1711 |
| 8 | 3868 |
| 9 | 8752 |
| 10 | 19680 |
| 11 | 43869 |
| 12 | 96695 |
| 13 | 210638 |
| 14 | 453863 |
| 15 | 968875 |
| 16 | 2053227 |
| 17 | 4328457 |
| 18 | 9093933 |
| 19 | 19068574 |
| 20 | 39943650 |
| 21 | 83628355 |
| 22 | 175018478 |
| 23 | 366081158 |
| 24 | 765102861 |
| 25 | 1597315609 |
| 26 | 3330380539 |
| 27 | 6933810090 |
| 28 | 14414812994 |
| 29 | 29924339675 |
| 30 | 62038821363 |