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 | 3 |
| 3 | 6 |
| 4 | 14 |
| 5 | 37 |
| 6 | 105 |
| 7 | 312 |
| 8 | 956 |
| 9 | 2996 |
| 10 | 9554 |
| 11 | 30897 |
| 12 | 101083 |
| 13 | 333947 |
| 14 | 1112497 |
| 15 | 3732956 |
| 16 | 12605030 |
| 17 | 42800318 |
| 18 | 146046820 |
| 19 | 500555448 |
| 20 | 1722402304 |
| 21 | 5948047170 |
| 22 | 20607691518 |
| 23 | 71610355541 |
| 24 | 249520257107 |
| 25 | 871614139397 |
| 26 | 3051737703527 |