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) |
|---|---|
| 0 | 1 |
| 1 | 25 |
| 2 | 151 |
| 3 | 478 |
| 4 | 1107 |
| 5 | 1585 |
| 6 | 2692 |
| 7 | 9661 |
| 8 | 12353 |
| 9 | 22014 |
| 10 | 34367 |
| 11 | 331317 |
| 12 | 365684 |
| 13 | 1428369 |
| 14 | 1794053 |
| 15 | 3222422 |
| 16 | 5016475 |
| 17 | 23288322 |
| 18 | 28304797 |
| 19 | 108202713 |
| 20 | 136507510 |
| 21 | 3793905483 |
| 22 | 3930412993 |
| 23 | 15585144462 |
| 24 | 81856135303 |
| 25 | 97441279765 |
| 26 | 276738694833 |
| 27 | 927657364264 |