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 | 1 |
| 2 | 20 |
| 3 | 141 |
| 4 | 580 |
| 5 | 1751 |
| 6 | 4332 |
| 7 | 9331 |
| 8 | 18152 |
| 9 | 32661 |
| 10 | 55252 |
| 11 | 88913 |
| 12 | 137292 |
| 13 | 204763 |
| 14 | 296492 |
| 15 | 418503 |
| 16 | 577744 |
| 17 | 782153 |
| 18 | 1040724 |
| 19 | 1363573 |
| 20 | 1762004 |
| 21 | 2248575 |
| 22 | 2837164 |
| 23 | 3543035 |
| 24 | 4382904 |
| 25 | 5375005 |
| 26 | 6539156 |
| 27 | 7896825 |
| 28 | 9471196 |
| 29 | 11287235 |
| 30 | 13371756 |