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 | 5 |
| 2 | 23 |
| 3 | 86 |
| 4 | 295 |
| 5 | 926 |
| 6 | 2748 |
| 7 | 7732 |
| 8 | 20891 |
| 9 | 54401 |
| 10 | 137355 |
| 11 | 337249 |
| 12 | 808043 |
| 13 | 1893402 |
| 14 | 4348634 |
| 15 | 9805669 |
| 16 | 21741925 |
| 17 | 47463473 |
| 18 | 102133056 |
| 19 | 216841459 |
| 20 | 454648373 |
| 21 | 942113618 |
| 22 | 1930779697 |
| 23 | 3915946921 |
| 24 | 7864385266 |
| 25 | 15647363323 |
| 26 | 30858285440 |
| 27 | 60345383394 |
| 28 | 117065924679 |