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 | 1 |
| 2 | 57 |
| 3 | 703 |
| 4 | 4033 |
| 5 | 15501 |
| 6 | 46441 |
| 7 | 117307 |
| 8 | 261633 |
| 9 | 530713 |
| 10 | 999001 |
| 11 | 1770231 |
| 12 | 2984257 |
| 13 | 4824613 |
| 14 | 7526793 |
| 15 | 11387251 |
| 16 | 16773121 |
| 17 | 24132657 |
| 18 | 34006393 |
| 19 | 47039023 |
| 20 | 63992001 |
| 21 | 85756861 |
| 22 | 113369257 |
| 23 | 148023723 |
| 24 | 191089153 |
| 25 | 244125001 |
| 26 | 308898201 |
| 27 | 387400807 |
| 28 | 481868353 |
| 29 | 594798933 |
| 30 | 728973001 |