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 | 5 |
| 2 | 35 |
| 3 | 235 |
| 4 | 1380 |
| 5 | 6711 |
| 6 | 26630 |
| 7 | 89695 |
| 8 | 266305 |
| 9 | 716460 |
| 10 | 1780978 |
| 11 | 4147915 |
| 12 | 9144485 |
| 13 | 19231895 |
| 14 | 38819255 |
| 15 | 75566971 |
| 16 | 142424625 |
| 17 | 260749275 |
| 18 | 464984685 |
| 19 | 809559075 |
| 20 | 1378889190 |
| 21 | 2301674475 |
| 22 | 3771041860 |
| 23 | 6072576655 |
| 24 | 9622868805 |
| 25 | 15021940010 |