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 | 2145 |
| 2 | 3916 |
| 3 | 7381 |
| 4 | 13530 |
| 5 | 843051 |
| 6 | 1547920 |
| 7 | 2926990 |
| 8 | 5374281 |
| 9 | 335521560 |
| 10 | 616057651 |
| 11 | 1164924046 |
| 12 | 2138939715 |
| 13 | 133536727236 |
| 14 | 245189386585 |
| 15 | 463636832725 |
| 16 | 851292621696 |
| 17 | 53147281907775 |
| 18 | 97584759792586 |
| 19 | 184526294489911 |
| 20 | 338812324484700 |
| 21 | 21152484662556621 |