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 | 3 |
| 3 | 10 |
| 4 | 30 |
| 5 | 94 |
| 6 | 287 |
| 7 | 854 |
| 8 | 2501 |
| 9 | 7222 |
| 10 | 20502 |
| 11 | 57412 |
| 12 | 158678 |
| 13 | 433204 |
| 14 | 1169274 |
| 15 | 3122747 |
| 16 | 8256669 |
| 17 | 21627238 |
| 18 | 56150750 |
| 19 | 144570308 |
| 20 | 369288160 |
| 21 | 936246670 |
| 22 | 2356750215 |
| 23 | 5892267672 |
| 24 | 14636329019 |
| 25 | 36131588682 |
| 26 | 88667056302 |
| 27 | 216353770900 |
| 28 | 525040244748 |
| 29 | 1267473283199 |