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) |
|---|---|
| 1 | 1 |
| 2 | 78 |
| 3 | 1758 |
| 4 | 38588 |
| 5 | 383246 |
| 6 | 2135344 |
| 7 | 8891854 |
| 8 | 30108310 |
| 9 | 86669806 |
| 10 | 219845764 |
| 11 | 504261973 |
| 12 | 1065642840 |
| 13 | 2104251027 |
| 14 | 3924818982 |
| 15 | 6973786593 |
| 16 | 11884673662 |
| 17 | 19532410762 |
| 18 | 31097451768 |
| 19 | 48140491605 |
| 20 | 72688612756 |
| 21 | 107333684073 |