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 | 5 |
| 4 | 14 |
| 5 | 26 |
| 6 | 70 |
| 7 | 138 |
| 8 | 362 |
| 9 | 742 |
| 10 | 1912 |
| 11 | 4028 |
| 12 | 10249 |
| 13 | 22033 |
| 14 | 55547 |
| 15 | 121273 |
| 16 | 303641 |
| 17 | 670997 |
| 18 | 1671233 |
| 19 | 3729071 |
| 20 | 9250099 |
| 21 | 20803231 |
| 22 | 51437219 |
| 23 | 116436313 |
| 24 | 287152067 |
| 25 | 653567143 |
| 26 | 1608416195 |
| 27 | 3677760541 |
| 28 | 9035150126 |
| 29 | 20741496354 |