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 | 108 |
| 3 | 1511 |
| 4 | 21497 |
| 5 | 305184 |
| 6 | 4334009 |
| 7 | 61545775 |
| 8 | 873996300 |
| 9 | 12411393231 |
| 10 | 176250978417 |
| 11 | 2502894414208 |
| 12 | 35542954271729 |
| 13 | 504736272807255 |
| 14 | 7167628868280044 |
| 15 | 101785638086283959 |
| 16 | 1445431440583263081 |
| 17 | 20526196904667164704 |
| 18 | 291487197206091205801 |