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 | 0 |
| 1 | 1 |
| 2 | 11 |
| 3 | 130 |
| 4 | 1529 |
| 5 | 17989 |
| 6 | 211640 |
| 7 | 2489941 |
| 8 | 29294111 |
| 9 | 344644690 |
| 10 | 4054738589 |
| 11 | 47703926689 |
| 12 | 561235840880 |
| 13 | 6602929589881 |
| 14 | 77683348056611 |
| 15 | 913943194931650 |
| 16 | 10752525276757649 |
| 17 | 126503266798718989 |
| 18 | 1488308662276727720 |
| 19 | 17509924686232475821 |