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 | 1 |
| 2 | 7 |
| 3 | 23 |
| 4 | 79 |
| 5 | 223 |
| 6 | 703 |
| 7 | 2175 |
| 8 | 6399 |
| 9 | 19455 |
| 10 | 58367 |
| 11 | 176127 |
| 12 | 528383 |
| 13 | 1589247 |
| 14 | 4767743 |
| 15 | 14319615 |
| 16 | 42991615 |
| 17 | 129105919 |
| 18 | 387186687 |
| 19 | 1161822207 |
| 20 | 3486515199 |
| 21 | 10458497023 |
| 22 | 31377588223 |
| 23 | 94136958975 |
| 24 | 282427654143 |
| 25 | 847282962431 |
| 26 | 2541815332863 |