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 | 28 |
| 2 | 351 |
| 3 | 7750 |
| 4 | 58653 |
| 5 | 885115 |
| 6 | 2412306 |
| 7 | 12066328 |
| 8 | 23519511 |
| 9 | 74011861 |
| 10 | 297399466 |
| 11 | 443736945 |
| 12 | 1282837878 |
| 13 | 2375017660 |
| 14 | 3160641771 |
| 15 | 5389555753 |
| 16 | 11082106126 |
| 17 | 21090164131 |
| 18 | 25760073690 |
| 19 | 45229040703 |
| 20 | 64049963005 |
| 21 | 75666918636 |