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 | 7 |
| 3 | 26 |
| 4 | 108 |
| 5 | 472 |
| 6 | 2159 |
| 7 | 10194 |
| 8 | 49396 |
| 9 | 244328 |
| 10 | 1229308 |
| 11 | 6273896 |
| 12 | 32410096 |
| 13 | 169181664 |
| 14 | 891181607 |
| 15 | 4731912082 |
| 16 | 25302648644 |
| 17 | 136150941064 |
| 18 | 736747902236 |
| 19 | 4007011320808 |
| 20 | 21893702201648 |
| 21 | 120125750018656 |
| 22 | 661630546993116 |
| 23 | 3656966382542984 |
| 24 | 20278320788680912 |
| 25 | 112782556853239712 |