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 | 0 |
| 3 | 0 |
| 4 | 76 |
| 5 | 629 |
| 6 | 2820 |
| 7 | 9767 |
| 8 | 26272 |
| 9 | 63162 |
| 10 | 135504 |
| 11 | 269334 |
| 12 | 489204 |
| 13 | 870943 |
| 14 | 1447460 |
| 15 | 2319069 |
| 16 | 3613088 |
| 17 | 5496580 |
| 18 | 8046288 |
| 19 | 11646108 |
| 20 | 16349868 |
| 21 | 22751289 |
| 22 | 31151020 |
| 23 | 41928083 |
| 24 | 55298280 |
| 25 | 72845822 |
| 26 | 94565584 |
| 27 | 121269906 |
| 28 | 154010268 |
| 29 | 194468499 |