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 | 3 |
| 2 | 6 |
| 3 | 14 |
| 4 | 34 |
| 5 | 82 |
| 6 | 196 |
| 7 | 473 |
| 8 | 1139 |
| 9 | 2744 |
| 10 | 6614 |
| 11 | 15940 |
| 12 | 38416 |
| 13 | 92589 |
| 14 | 223151 |
| 15 | 537824 |
| 16 | 1296233 |
| 17 | 3124105 |
| 18 | 7529536 |
| 19 | 18147253 |
| 20 | 43737462 |
| 21 | 105413504 |
| 22 | 254061542 |
| 23 | 612324459 |
| 24 | 1475789056 |
| 25 | 3556861577 |
| 26 | 8572542415 |
| 27 | 20661046784 |
| 28 | 49796062077 |
| 29 | 120015593800 |
| 30 | 289254654976 |