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 | 9 |
| 2 | 221 |
| 3 | 2227 |
| 4 | 15458 |
| 5 | 80196 |
| 6 | 334072 |
| 7 | 1173240 |
| 8 | 3598120 |
| 9 | 9856552 |
| 10 | 24553080 |
| 11 | 56423032 |
| 12 | 121013800 |
| 13 | 244555560 |
| 14 | 469343992 |
| 15 | 860997880 |
| 16 | 1517994792 |
| 17 | 2583928360 |
| 18 | 4262971000 |
| 19 | 6839066232 |
| 20 | 10699415080 |
| 21 | 16362861352 |
| 22 | 24513820920 |
| 23 | 36042440440 |
| 24 | 52091711272 |
| 25 | 74112304680 |