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 | 11 |
| 4 | 33 |
| 5 | 166 |
| 6 | 589 |
| 7 | 2216 |
| 8 | 8935 |
| 9 | 33984 |
| 10 | 137056 |
| 11 | 539085 |
| 12 | 2100341 |
| 13 | 8324716 |
| 14 | 32607928 |
| 15 | 128652672 |
| 16 | 507032667 |
| 17 | 1992083368 |
| 18 | 7853132654 |
| 19 | 30894420646 |
| 20 | 121642017784 |
| 21 | 479048967517 |
| 22 | 1885229164497 |
| 23 | 7423732617043 |
| 24 | 29223734864421 |
| 25 | 115048209160729 |
| 26 | 452968829090506 |