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 | 13 |
| 2 | 77 |
| 3 | 325 |
| 4 | 1181 |
| 5 | 3973 |
| 6 | 12797 |
| 7 | 40165 |
| 8 | 124061 |
| 9 | 379333 |
| 10 | 1152317 |
| 11 | 3485605 |
| 12 | 10514141 |
| 13 | 31657093 |
| 14 | 95200637 |
| 15 | 286060645 |
| 16 | 859099421 |
| 17 | 2579133253 |
| 18 | 7741069757 |
| 19 | 23230549285 |
| 20 | 69706327901 |
| 21 | 209148343813 |
| 22 | 627503751677 |
| 23 | 1882628695525 |
| 24 | 5648120967581 |
| 25 | 16944832664773 |