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 | 13 |
| 3 | 26 |
| 4 | 66 |
| 5 | 154 |
| 6 | 380 |
| 7 | 904 |
| 8 | 2204 |
| 9 | 5286 |
| 10 | 12818 |
| 11 | 30854 |
| 12 | 74636 |
| 13 | 179948 |
| 14 | 434820 |
| 15 | 1049122 |
| 16 | 2533818 |
| 17 | 6115538 |
| 18 | 14766868 |
| 19 | 35646080 |
| 20 | 86064196 |
| 21 | 207766110 |
| 22 | 501609946 |
| 23 | 1210964110 |
| 24 | 2923573588 |
| 25 | 7058053972 |
| 26 | 17039774268 |