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 | 3 |
| 2 | 11 |
| 3 | 36 |
| 4 | 102 |
| 5 | 370 |
| 6 | 1243 |
| 7 | 3854 |
| 8 | 13078 |
| 9 | 43861 |
| 10 | 141109 |
| 11 | 468638 |
| 12 | 1561065 |
| 13 | 5101698 |
| 14 | 16842125 |
| 15 | 55830567 |
| 16 | 183595621 |
| 17 | 605376713 |
| 18 | 2001499842 |
| 19 | 6596762626 |
| 20 | 21752445702 |
| 21 | 71828204711 |
| 22 | 236917416288 |
| 23 | 781388833534 |
| 24 | 2578812375049 |
| 25 | 8507768092491 |