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 | 4 |
| 4 | 11 |
| 5 | 31 |
| 6 | 106 |
| 7 | 372 |
| 8 | 1499 |
| 9 | 6211 |
| 10 | 28606 |
| 11 | 135356 |
| 12 | 697357 |
| 13 | 3688049 |
| 14 | 20935006 |
| 15 | 121837276 |
| 16 | 753159801 |
| 17 | 4767863657 |
| 18 | 31807384354 |
| 19 | 217048147396 |
| 20 | 1551200297291 |
| 21 | 11327527814191 |
| 22 | 86206555248122 |
| 23 | 669666314150164 |
| 24 | 5399592811359331 |
| 25 | 44398500646885851 |