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 | 33 |
| 5 | 81 |
| 6 | 196 |
| 7 | 472 |
| 8 | 1138 |
| 9 | 2744 |
| 10 | 6613 |
| 11 | 15939 |
| 12 | 38416 |
| 13 | 92588 |
| 14 | 223150 |
| 15 | 537824 |
| 16 | 1296232 |
| 17 | 3124104 |
| 18 | 7529536 |
| 19 | 18147252 |
| 20 | 43737461 |
| 21 | 105413504 |
| 22 | 254061541 |
| 23 | 612324458 |
| 24 | 1475789056 |
| 25 | 3556861576 |
| 26 | 8572542414 |
| 27 | 20661046784 |
| 28 | 49796062076 |
| 29 | 120015593799 |
| 30 | 289254654976 |