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 | 4 |
| 3 | 10 |
| 4 | 29 |
| 5 | 93 |
| 6 | 314 |
| 7 | 1086 |
| 8 | 3797 |
| 9 | 13346 |
| 10 | 47063 |
| 11 | 166416 |
| 12 | 590090 |
| 13 | 2098694 |
| 14 | 7488519 |
| 15 | 26813197 |
| 16 | 96354259 |
| 17 | 347536624 |
| 18 | 1258206722 |
| 19 | 4572144768 |
| 20 | 16675669693 |
| 21 | 61039087954 |
| 22 | 224207709627 |
| 23 | 826341998343 |
| 24 | 3055482044305 |
| 25 | 11333152257127 |
| 26 | 42161040222916 |
| 27 | 157289354573120 |