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 | 0 |
| 2 | 1 |
| 3 | 2 |
| 4 | 15 |
| 5 | 197 |
| 6 | 211 |
| 7 | 461 |
| 8 | 2745 |
| 9 | 2955 |
| 10 | 38417 |
| 11 | 38613 |
| 12 | 41175 |
| 13 | 537825 |
| 14 | 540765 |
| 15 | 576255 |
| 16 | 7529537 |
| 17 | 7532281 |
| 18 | 7568149 |
| 19 | 8067375 |
| 20 | 8070119 |
| 21 | 105413505 |
| 22 | 105454665 |
| 23 | 105951525 |
| 24 | 112943055 |