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 | 3 |
| 2 | 8 |
| 3 | 22 |
| 4 | 63 |
| 5 | 185 |
| 6 | 550 |
| 7 | 1644 |
| 8 | 4925 |
| 9 | 14767 |
| 10 | 44292 |
| 11 | 132866 |
| 12 | 398587 |
| 13 | 1195749 |
| 14 | 3587234 |
| 15 | 10761688 |
| 16 | 32285049 |
| 17 | 96855131 |
| 18 | 290565376 |
| 19 | 871696110 |
| 20 | 2615088311 |
| 21 | 7845264913 |
| 22 | 23535794718 |
| 23 | 70607384132 |
| 24 | 211822152373 |
| 25 | 635466457095 |
| 26 | 1906399371260 |