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 | 9 |
| 3 | 30 |
| 4 | 87 |
| 5 | 234 |
| 6 | 597 |
| 7 | 1470 |
| 8 | 3522 |
| 9 | 8264 |
| 10 | 19067 |
| 11 | 43398 |
| 12 | 97659 |
| 13 | 217674 |
| 14 | 481221 |
| 15 | 1056370 |
| 16 | 2304676 |
| 17 | 5000934 |
| 18 | 10799564 |
| 19 | 23222114 |
| 20 | 49742577 |
| 21 | 106181710 |
| 22 | 225947089 |
| 23 | 479426238 |
| 24 | 1014615466 |
| 25 | 2142099088 |
| 26 | 4512515283 |
| 27 | 9486635788 |
| 28 | 19906068415 |
| 29 | 41696243298 |
| 30 | 87196489799 |