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 | 3 |
| 3 | 7 |
| 4 | 25 |
| 5 | 81 |
| 6 | 331 |
| 7 | 1303 |
| 8 | 5937 |
| 9 | 26785 |
| 10 | 133651 |
| 11 | 669351 |
| 12 | 3609673 |
| 13 | 19674097 |
| 14 | 113525595 |
| 15 | 664400311 |
| 16 | 4070168161 |
| 17 | 25330978113 |
| 18 | 163716695587 |
| 19 | 1075631907655 |
| 20 | 7296866339961 |
| 21 | 50322142646161 |
| 22 | 356790528924523 |
| 23 | 2570964805355607 |
| 24 | 18983329135883665 |
| 25 | 142389639792952801 |
| 26 | 1091556096587136051 |