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 | 19 |
| 2 | 361 |
| 3 | 1095 |
| 4 | 4018 |
| 5 | 16920 |
| 6 | 56651 |
| 7 | 178627 |
| 8 | 581166 |
| 9 | 1838374 |
| 10 | 5659448 |
| 11 | 17426525 |
| 12 | 53447015 |
| 13 | 162579914 |
| 14 | 493375310 |
| 15 | 1495959569 |
| 16 | 4527344211 |
| 17 | 13690772759 |
| 18 | 41408994328 |
| 19 | 125273246604 |
| 20 | 379174015659 |
| 21 | 1148704163123 |
| 22 | 3483663286586 |