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 | -555731 |
| 1 | 1 |
| 2 | 29525 |
| 3 | 1657129 |
| 4 | 16591741 |
| 5 | 80872529 |
| 6 | 269614501 |
| 7 | 711754105 |
| 8 | 1604794829 |
| 9 | 3229552801 |
| 10 | 5964902389 |
| 11 | 10302521801 |
| 12 | 16861638685 |
| 13 | 26403775729 |
| 14 | 39847496261 |
| 15 | 58283149849 |
| 16 | 82987617901 |
| 17 | 115439059265 |
| 18 | 157331655829 |
| 19 | 210590358121 |
| 20 | 277385630909 |
| 21 | 360148198801 |