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 | 0 |
| 2 | 0 |
| 3 | 2 |
| 4 | 4 |
| 5 | 6 |
| 6 | 14 |
| 7 | 34 |
| 8 | 72 |
| 9 | 154 |
| 10 | 346 |
| 11 | 774 |
| 12 | 1714 |
| 13 | 3822 |
| 14 | 8574 |
| 15 | 19238 |
| 16 | 43204 |
| 17 | 97254 |
| 18 | 219286 |
| 19 | 494962 |
| 20 | 1118502 |
| 21 | 2530522 |
| 22 | 5730762 |
| 23 | 12989634 |
| 24 | 29467718 |
| 25 | 66901378 |
| 26 | 151996338 |
| 27 | 345556218 |
| 28 | 786092266 |
| 29 | 1789284762 |
| 30 | 4074927962 |
| 31 | 9284968682 |
| 32 | 21166439112 |
| 33 | 48273612954 |
| 34 | 110142596298 |