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 | 9 |
| 3 | 38 |
| 4 | 96 |
| 5 | 277 |
| 6 | 1421 |
| 7 | 2464 |
| 8 | 6654 |
| 9 | 61802 |
| 10 | 293298 |
| 11 | 977440 |
| 12 | 3457374 |
| 13 | 15961755 |
| 14 | 68638807 |
| 15 | 261722656 |
| 16 | 993323854 |
| 17 | 4081202724 |
| 18 | 16722068344 |
| 19 | 65831346572 |
| 20 | 256639112606 |
| 21 | 1025719342194 |
| 22 | 4118393609362 |
| 23 | 16324710723952 |