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 | 0 |
| 1 | 2 |
| 2 | 130 |
| 3 | 1588 |
| 4 | 9780 |
| 5 | 41030 |
| 6 | 134342 |
| 7 | 369640 |
| 8 | 893928 |
| 9 | 1956810 |
| 10 | 3956810 |
| 11 | 7499932 |
| 12 | 13471900 |
| 13 | 23125518 |
| 14 | 38184590 |
| 15 | 60965840 |
| 16 | 94520272 |
| 17 | 142795410 |
| 18 | 210819858 |
| 19 | 304911620 |
| 20 | 432911620 |
| 21 | 604443862 |
| 22 | 831203670 |
| 23 | 1127275448 |
| 24 | 1509481400 |
| 25 | 1997762650 |
| 26 | 2615594202 |
| 27 | 3390435180 |