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) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 4 |
| 4 | 11 |
| 5 | 27 |
| 6 | 70 |
| 7 | 185 |
| 8 | 499 |
| 9 | 1356 |
| 10 | 3695 |
| 11 | 10075 |
| 12 | 27482 |
| 13 | 74997 |
| 14 | 204751 |
| 15 | 559172 |
| 16 | 1527379 |
| 17 | 4172439 |
| 18 | 11398634 |
| 19 | 31140481 |
| 20 | 85075307 |
| 21 | 232426476 |
| 22 | 634995031 |
| 23 | 1734829379 |
| 24 | 4739627674 |
| 25 | 12948881373 |
| 26 | 35376966263 |
| 27 | 96651610708 |
| 28 | 264057013451 |
| 29 | 721417015071 |
| 30 | 1970947675114 |