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) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 1 |
| 5 | 2 |
| 6 | 6 |
| 7 | 25 |
| 8 | 92 |
| 9 | 341 |
| 10 | 1225 |
| 11 | 4366 |
| 12 | 15522 |
| 13 | 55312 |
| 14 | 197965 |
| 15 | 712244 |
| 16 | 2577106 |
| 17 | 9375361 |
| 18 | 34284972 |
| 19 | 125977465 |
| 20 | 464938190 |
| 21 | 1722817416 |
| 22 | 6407307544 |
| 23 | 23909159418 |
| 24 | 89491715106 |
| 25 | 335908316845 |
| 26 | 1264097675776 |
| 27 | 4768430557021 |