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 | 3 |
| 2 | 6 |
| 3 | 21 |
| 4 | 456 |
| 5 | 1365 |
| 6 | 2205 |
| 7 | 2451 |
| 8 | 2730 |
| 9 | 8541 |
| 10 | 18486 |
| 11 | 32199 |
| 12 | 32319 |
| 13 | 32781 |
| 14 | 45864 |
| 15 | 61215 |
| 16 | 72555 |
| 17 | 72561 |
| 18 | 82146 |
| 19 | 83259 |
| 20 | 86604 |
| 21 | 91371 |
| 22 | 95199 |
| 23 | 125334 |
| 24 | 149331 |
| 25 | 176889 |
| 26 | 182910 |
| 27 | 185535 |
| 28 | 210846 |
| 29 | 225666 |
| 30 | 226254 |
| 31 | 288420 |
| 32 | 343161 |
| 33 | 350091 |
| 34 | 403941 |
| 35 | 411501 |
| 36 | 510399 |
| 37 | 567204 |