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 | 2 |
| 2 | 5 |
| 3 | 12 |
| 4 | 29 |
| 5 | 69 |
| 6 | 161 |
| 7 | 376 |
| 8 | 878 |
| 9 | 2050 |
| 10 | 4783 |
| 11 | 11162 |
| 12 | 26044 |
| 13 | 60771 |
| 14 | 141799 |
| 15 | 330865 |
| 16 | 772020 |
| 17 | 1801380 |
| 18 | 4203220 |
| 19 | 9807513 |
| 20 | 22884198 |
| 21 | 53396463 |
| 22 | 124591747 |
| 23 | 290714077 |
| 24 | 678332846 |
| 25 | 1582776641 |
| 26 | 3693145496 |
| 27 | 8617339492 |
| 28 | 20107125483 |
| 29 | 46916626127 |