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 | 54 |
| 1 | 105 |
| 2 | 311 |
| 3 | 1281 |
| 4 | 6407 |
| 5 | 35745 |
| 6 | 212951 |
| 7 | 1323441 |
| 8 | 8464487 |
| 9 | 55247745 |
| 10 | 365983991 |
| 11 | 2451448401 |
| 12 | 16559916167 |
| 13 | 112602093345 |
| 14 | 769628452631 |
| 15 | 5282089330161 |
| 16 | 36372360161447 |
| 17 | 251135368228545 |
| 18 | 1737811434946871 |
| 19 | 12047233511096721 |
| 20 | 83642479068080327 |
| 21 | 581449745964789345 |