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 | 51 |
| 2 | 5201 |
| 3 | 530451 |
| 4 | 54100801 |
| 5 | 5517751251 |
| 6 | 562756526801 |
| 7 | 57395647982451 |
| 8 | 5853793337683201 |
| 9 | 597029524795704051 |
| 10 | 60891157735824130001 |
| 11 | 6210301059529265556051 |
| 12 | 633389816914249262587201 |