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 | 10 |
| 3 | 36 |
| 4 | 145 |
| 5 | 560 |
| 6 | 2197 |
| 7 | 8568 |
| 8 | 33490 |
| 9 | 130790 |
| 10 | 510949 |
| 11 | 1995840 |
| 12 | 7796413 |
| 13 | 30454814 |
| 14 | 118965250 |
| 15 | 464711184 |
| 16 | 1815292333 |
| 17 | 7091038640 |
| 18 | 27699580729 |
| 19 | 108202305420 |
| 20 | 422668460890 |
| 21 | 1651061182538 |
| 22 | 6449506621417 |
| 23 | 25193576136960 |