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 | 63 |
| 1 | 455 |
| 2 | 1611 |
| 3 | 2709 |
| 4 | 12365 |
| 5 | 20630 |
| 6 | 37463 |
| 7 | 70299 |
| 8 | 135886 |
| 9 | 786510 |
| 10 | 1310867 |
| 11 | 2363919 |
| 12 | 12582995 |
| 13 | 20971674 |
| 14 | 37749317 |
| 15 | 71307271 |
| 16 | 138674310 |
| 17 | 272892511 |
| 18 | 541332108 |
| 19 | 3221225558 |
| 20 | 5368709276 |
| 21 | 9663677009 |
| 22 | 18253615171 |
| 23 | 35433742539 |