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 | 1 |
| 1 | 6 |
| 2 | 17 |
| 3 | 44 |
| 4 | 109 |
| 5 | 266 |
| 6 | 645 |
| 7 | 1560 |
| 8 | 3769 |
| 9 | 9102 |
| 10 | 21977 |
| 11 | 53060 |
| 12 | 128101 |
| 13 | 309266 |
| 14 | 746637 |
| 15 | 1802544 |
| 16 | 4351729 |
| 17 | 10506006 |
| 18 | 25363745 |
| 19 | 61233500 |
| 20 | 147830749 |
| 21 | 356895002 |
| 22 | 861620757 |
| 23 | 2080136520 |
| 24 | 5021893801 |
| 25 | 12123924126 |
| 26 | 29269742057 |
| 27 | 70663408244 |
| 28 | 170596558549 |
| 29 | 411856525346 |
| 30 | 994309609245 |