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 | 9 |
| 2 | 46 |
| 3 | 177 |
| 4 | 571 |
| 5 | 1632 |
| 6 | 4270 |
| 7 | 10446 |
| 8 | 24244 |
| 9 | 53942 |
| 10 | 115954 |
| 11 | 242240 |
| 12 | 494087 |
| 13 | 987503 |
| 14 | 1939634 |
| 15 | 3753007 |
| 16 | 7167461 |
| 17 | 13532608 |
| 18 | 25293964 |
| 19 | 46856332 |
| 20 | 86110792 |
| 21 | 157125052 |
| 22 | 284866900 |
| 23 | 513470464 |
| 24 | 920659517 |
| 25 | 1642844485 |
| 26 | 2918680214 |
| 27 | 5164483453 |
| 28 | 9104522495 |
| 29 | 15995633440 |