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 | 1 |
| 3 | 2 |
| 4 | 6 |
| 5 | 19 |
| 6 | 68 |
| 7 | 236 |
| 8 | 863 |
| 9 | 3137 |
| 10 | 11636 |
| 11 | 43306 |
| 12 | 162728 |
| 13 | 614142 |
| 14 | 2330454 |
| 15 | 8875656 |
| 16 | 33924699 |
| 17 | 130038017 |
| 18 | 499753560 |
| 19 | 1924912505 |
| 20 | 7429159770 |
| 21 | 28723877046 |
| 22 | 111236422377 |
| 23 | 431403469046 |
| 24 | 1675316533812 |
| 25 | 6513837677642 |
| 26 | 25354842098354 |
| 27 | 98794053266471 |
| 28 | 385312558567775 |