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 | 2 |
| 3 | 5 |
| 4 | 14 |
| 5 | 40 |
| 6 | 121 |
| 7 | 373 |
| 8 | 1184 |
| 9 | 3823 |
| 10 | 12554 |
| 11 | 41733 |
| 12 | 140301 |
| 13 | 475934 |
| 14 | 1627440 |
| 15 | 5602983 |
| 16 | 19406703 |
| 17 | 67574371 |
| 18 | 236409625 |
| 19 | 830582851 |
| 20 | 2929246932 |
| 21 | 10366380583 |
| 22 | 36801225872 |
| 23 | 131021870786 |
| 24 | 467701875135 |
| 25 | 1673584553886 |
| 26 | 6002046468815 |
| 27 | 21570135722058 |
| 28 | 77668429499325 |
| 29 | 280167079428684 |
| 30 | 1012323004985313 |