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 | 20 |
| 2 | 128 |
| 3 | 656 |
| 4 | 3928 |
| 5 | 23840 |
| 6 | 148304 |
| 7 | 934968 |
| 8 | 5958552 |
| 9 | 38285216 |
| 10 | 247607348 |
| 11 | 1609914524 |
| 12 | 10513615792 |
| 13 | 68913452056 |
| 14 | 453123210178 |
| 15 | 2987405569166 |
| 16 | 19741419610536 |
| 17 | 130718419293680 |
| 18 | 867078544410362 |
| 19 | 5760352822741182 |