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 | 3 |
| 2 | 10 |
| 3 | 31 |
| 4 | 96 |
| 5 | 296 |
| 6 | 912 |
| 7 | 2809 |
| 8 | 8651 |
| 9 | 26642 |
| 10 | 82047 |
| 11 | 252672 |
| 12 | 778128 |
| 13 | 2396320 |
| 14 | 7379697 |
| 15 | 22726483 |
| 16 | 69988378 |
| 17 | 215535903 |
| 18 | 663763424 |
| 19 | 2044122936 |
| 20 | 6295072048 |
| 21 | 19386276329 |
| 22 | 59701891739 |
| 23 | 183857684514 |
| 24 | 566207320575 |
| 25 | 1743689586432 |