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 | 7 |
| 2 | 17 |
| 3 | 119 |
| 4 | 273 |
| 5 | 1911 |
| 6 | 4369 |
| 7 | 30583 |
| 8 | 69905 |
| 9 | 489335 |
| 10 | 1118481 |
| 11 | 7829367 |
| 12 | 17895697 |
| 13 | 125269879 |
| 14 | 286331153 |
| 15 | 2004318071 |
| 16 | 4581298449 |
| 17 | 32069089143 |
| 18 | 73300775185 |
| 19 | 513105426295 |
| 20 | 1172812402961 |
| 21 | 8209686820727 |
| 22 | 18764998447377 |
| 23 | 131354989131639 |
| 24 | 300239975158033 |