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 | 2 |
| 3 | 5 |
| 4 | 14 |
| 5 | 41 |
| 6 | 121 |
| 7 | 355 |
| 8 | 1032 |
| 9 | 2974 |
| 10 | 8509 |
| 11 | 24210 |
| 12 | 68595 |
| 13 | 193753 |
| 14 | 546041 |
| 15 | 1536358 |
| 16 | 4317652 |
| 17 | 12123685 |
| 18 | 34021810 |
| 19 | 95431301 |
| 20 | 267601625 |
| 21 | 750221859 |
| 22 | 2102913404 |
| 23 | 5893910702 |
| 24 | 16517729313 |
| 25 | 46288368894 |
| 26 | 129710571239 |
| 27 | 363467837569 |
| 28 | 1018468044881 |
| 29 | 2853791650010 |