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 | 16 |
| 2 | 100 |
| 3 | 508 |
| 4 | 3004 |
| 5 | 18036 |
| 6 | 110980 |
| 7 | 692204 |
| 8 | 4364284 |
| 9 | 27740164 |
| 10 | 177454720 |
| 11 | 1141017256 |
| 12 | 7367263276 |
| 13 | 47731405088 |
| 14 | 310118484762 |
| 15 | 2019608005218 |
| 16 | 13178042856428 |
| 17 | 86126612389832 |
| 18 | 563648913800290 |
| 19 | 3692893237251226 |