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 | 5 |
| 4 | 11 |
| 5 | 26 |
| 6 | 57 |
| 7 | 131 |
| 8 | 296 |
| 9 | 669 |
| 10 | 1515 |
| 11 | 3430 |
| 12 | 7765 |
| 13 | 17577 |
| 14 | 39790 |
| 15 | 90069 |
| 16 | 203897 |
| 17 | 461562 |
| 18 | 1044847 |
| 19 | 2365239 |
| 20 | 5354224 |
| 21 | 12120455 |
| 22 | 27437267 |
| 23 | 62110208 |
| 24 | 140599921 |
| 25 | 318278385 |
| 26 | 720492104 |
| 27 | 1630990029 |
| 28 | 3692099407 |
| 29 | 8357867190 |
| 30 | 18919843773 |
| 31 | 42829166807 |
| 32 | 96953101328 |
| 33 | 219474357191 |
| 34 | 496827773575 |