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 | 1 |
| 2 | 2 |
| 3 | 6 |
| 4 | 23 |
| 5 | 102 |
| 6 | 495 |
| 7 | 2549 |
| 8 | 13682 |
| 9 | 75714 |
| 10 | 428882 |
| 11 | 2474573 |
| 12 | 14492346 |
| 13 | 85926361 |
| 14 | 514763279 |
| 15 | 3111119358 |
| 16 | 18946375767 |
| 17 | 116147683902 |
| 18 | 716179441293 |
| 19 | 4438862153246 |
| 20 | 27638747494178 |
| 21 | 172805469880497 |
| 22 | 1084462349973559 |
| 23 | 6828717036765622 |
| 24 | 43132158190994223 |
| 25 | 273204023401012901 |