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 | 1 |
| 2 | 3 |
| 3 | 8 |
| 4 | 24 |
| 5 | 73 |
| 6 | 239 |
| 7 | 808 |
| 8 | 2839 |
| 9 | 10173 |
| 10 | 37107 |
| 11 | 136778 |
| 12 | 508622 |
| 13 | 1902931 |
| 14 | 7156180 |
| 15 | 27020991 |
| 16 | 102387426 |
| 17 | 389129477 |
| 18 | 1482851762 |
| 19 | 5664065704 |
| 20 | 21681357734 |
| 21 | 83154466615 |
| 22 | 319486977769 |
| 23 | 1229491584784 |
| 24 | 4738571829454 |
| 25 | 18288152053984 |
| 26 | 70672285064968 |
| 27 | 273430196389027 |