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 | 6 |
| 4 | 15 |
| 5 | 31 |
| 6 | 77 |
| 7 | 171 |
| 8 | 410 |
| 9 | 957 |
| 10 | 2275 |
| 11 | 5370 |
| 12 | 12795 |
| 13 | 30366 |
| 14 | 72307 |
| 15 | 172071 |
| 16 | 409875 |
| 17 | 976155 |
| 18 | 2325804 |
| 19 | 5541230 |
| 20 | 13204161 |
| 21 | 31464226 |
| 22 | 74980838 |
| 23 | 178684715 |
| 24 | 425830008 |
| 25 | 1014816979 |
| 26 | 2418489344 |
| 27 | 5763712776 |
| 28 | 13736075563 |
| 29 | 32735874251 |
| 30 | 78016456122 |
| 31 | 185929792353 |
| 32 | 443110675075 |