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 | 10 |
| 2 | 52 |
| 3 | 208 |
| 4 | 736 |
| 5 | 2440 |
| 6 | 7792 |
| 7 | 24328 |
| 8 | 74896 |
| 9 | 228520 |
| 10 | 693232 |
| 11 | 2095048 |
| 12 | 6315856 |
| 13 | 19009000 |
| 14 | 57149872 |
| 15 | 171695368 |
| 16 | 515577616 |
| 17 | 1547715880 |
| 18 | 4645113712 |
| 19 | 13939273288 |
| 20 | 41825684176 |
| 21 | 125492781160 |
| 22 | 376509800752 |
| 23 | 1129592316808 |
| 24 | 3388902779536 |
| 25 | 10166959996840 |