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 | 4 |
| 2 | 14 |
| 3 | 44 |
| 4 | 124 |
| 5 | 394 |
| 6 | 1418 |
| 7 | 4706 |
| 8 | 14322 |
| 9 | 40712 |
| 10 | 135878 |
| 11 | 468934 |
| 12 | 1513650 |
| 13 | 4502864 |
| 14 | 13421408 |
| 15 | 45258442 |
| 16 | 152708520 |
| 17 | 483810550 |
| 18 | 1413811358 |
| 19 | 4483843328 |
| 20 | 15051967962 |
| 21 | 49724234652 |
| 22 | 154802614364 |
| 23 | 461020649750 |
| 24 | 1486736569982 |