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 | 62 |
| 2 | 1891 |
| 3 | 37820 |
| 4 | 557845 |
| 5 | 6471002 |
| 6 | 61474519 |
| 7 | 491796152 |
| 8 | 3381098545 |
| 9 | 20286591270 |
| 10 | 107518933731 |
| 11 | 508271323092 |
| 12 | 2160153123141 |
| 13 | 8308281242850 |
| 14 | 29078984349975 |
| 15 | 93052749919920 |
| 16 | 273342452889765 |
| 17 | 739632519584070 |
| 18 | 1849081298960175 |
| 19 | 4282083008118300 |