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 | 1 |
| 3 | 2 |
| 4 | 6 |
| 5 | 15 |
| 6 | 43 |
| 7 | 124 |
| 8 | 379 |
| 9 | 1172 |
| 10 | 3730 |
| 11 | 12023 |
| 12 | 39388 |
| 13 | 130377 |
| 14 | 436066 |
| 15 | 1470271 |
| 16 | 4994083 |
| 17 | 17069343 |
| 18 | 58669677 |
| 19 | 202648664 |
| 20 | 703064353 |
| 21 | 2448871526 |
| 22 | 8560428736 |
| 23 | 30021944259 |
| 24 | 105602286616 |
| 25 | 372469127865 |
| 26 | 1317027839250 |
| 27 | 4667702488376 |
| 28 | 16578315095909 |