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 | 11 |
| 3 | 34 |
| 4 | 96 |
| 5 | 256 |
| 6 | 656 |
| 7 | 1632 |
| 8 | 3968 |
| 9 | 9472 |
| 10 | 22272 |
| 11 | 51712 |
| 12 | 118784 |
| 13 | 270336 |
| 14 | 610304 |
| 15 | 1368064 |
| 16 | 3047424 |
| 17 | 6750208 |
| 18 | 14876672 |
| 19 | 32636928 |
| 20 | 71303168 |
| 21 | 155189248 |
| 22 | 336592896 |
| 23 | 727711744 |
| 24 | 1568669696 |
| 25 | 3372220416 |
| 26 | 7230980096 |
| 27 | 15468593152 |
| 28 | 33017561088 |