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 | 21 |
| 3 | 111 |
| 4 | 447 |
| 5 | 1097 |
| 6 | 2897 |
| 7 | 5347 |
| 8 | 10787 |
| 9 | 18158 |
| 10 | 31158 |
| 11 | 45920 |
| 12 | 76160 |
| 13 | 104890 |
| 14 | 153890 |
| 15 | 212390 |
| 16 | 299686 |
| 17 | 383496 |
| 18 | 530916 |
| 19 | 661598 |
| 20 | 879998 |
| 21 | 1100498 |
| 22 | 1395738 |
| 23 | 1676108 |
| 24 | 2165708 |
| 25 | 2572583 |
| 26 | 3147183 |
| 27 | 3744963 |
| 28 | 4568163 |
| 29 | 5276285 |
| 30 | 6446285 |
| 31 | 7370767 |
| 32 | 8768527 |
| 33 | 10097107 |