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 | 19 |
| 2 | 361 |
| 3 | 1995 |
| 4 | 11025 |
| 5 | 94605 |
| 6 | 811801 |
| 7 | 5866411 |
| 8 | 42393121 |
| 9 | 327288437 |
| 10 | 2526771289 |
| 11 | 19008214715 |
| 12 | 142993641025 |
| 13 | 1086798939915 |
| 14 | 8260031196729 |
| 15 | 62521114891599 |
| 16 | 473229424222569 |
| 17 | 3587920094200239 |
| 18 | 27202811032966009 |
| 19 | 206103852899096453 |