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 | 83 |
| 2 | 3403 |
| 3 | 91881 |
| 4 | 1837620 |
| 5 | 29034396 |
| 6 | 377447148 |
| 7 | 4151918628 |
| 8 | 39443226966 |
| 9 | 328693558050 |
| 10 | 2432332329570 |
| 11 | 16141841823510 |
| 12 | 96851050941060 |
| 13 | 528955739755020 |
| 14 | 2644778698775100 |
| 15 | 12165982014365460 |
| 16 | 51705423561053205 |
| 17 | 203780198740621455 |
| 18 | 747194062048945335 |