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 | 3 |
| 4 | 7 |
| 5 | 11 |
| 6 | 71 |
| 7 | 107 |
| 8 | 115 |
| 9 | 139 |
| 10 | 155 |
| 11 | 681 |
| 12 | 1671 |
| 13 | 4876 |
| 14 | 21464 |
| 15 | 30046 |
| 16 | 311271 |
| 17 | 788749 |
| 18 | 10893662 |
| 19 | 20743270 |
| 20 | 134568163 |
| 21 | 163879554 |
| 22 | 920161004 |
| 23 | 6364787032 |
| 24 | 21400458779 |
| 25 | 47934932406 |
| 26 | 56133884369 |
| 27 | 288050185452 |
| 28 | 536023681676 |
| 29 | 1484061538595 |