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 | 1 |
| 2 | 5 |
| 3 | 37 |
| 4 | 363 |
| 5 | 4441 |
| 6 | 65133 |
| 7 | 1114009 |
| 8 | 21771851 |
| 9 | 478658101 |
| 10 | 11692343253 |
| 11 | 314170940293 |
| 12 | 9209104364331 |
| 13 | 292435635165649 |
| 14 | 10000637145321917 |
| 15 | 366427621403088433 |
| 16 | 14321135069200849515 |
| 17 | 594696814358067968461 |
| 18 | 26147933188037724372069 |