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 | 21 |
| 2 | 63 |
| 3 | 147 |
| 4 | 189 |
| 5 | 441 |
| 6 | 567 |
| 7 | 1029 |
| 8 | 1323 |
| 9 | 1701 |
| 10 | 3087 |
| 11 | 3969 |
| 12 | 5103 |
| 13 | 7203 |
| 14 | 9261 |
| 15 | 11907 |
| 16 | 15309 |
| 17 | 21609 |
| 18 | 27783 |
| 19 | 35721 |
| 20 | 45927 |
| 21 | 50421 |
| 22 | 64827 |
| 23 | 83349 |
| 24 | 107163 |
| 25 | 137781 |
| 26 | 151263 |
| 27 | 194481 |
| 28 | 250047 |
| 29 | 321489 |
| 30 | 352947 |
| 31 | 413343 |
| 32 | 453789 |
| 33 | 583443 |
| 34 | 750141 |
| 35 | 964467 |