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 | 2 |
| 2 | 6 |
| 3 | 38 |
| 4 | 86 |
| 5 | 282 |
| 6 | 1074 |
| 7 | 2802 |
| 8 | 8694 |
| 9 | 30170 |
| 10 | 82286 |
| 11 | 251682 |
| 12 | 837026 |
| 13 | 2336882 |
| 14 | 7101030 |
| 15 | 23060898 |
| 16 | 65306934 |
| 17 | 197740602 |
| 18 | 632536014 |
| 19 | 1808535522 |
| 20 | 5464051326 |
| 21 | 17297449410 |
| 22 | 49797577110 |
| 23 | 150233445162 |
| 24 | 471996750978 |
| 25 | 1365869873682 |
| 26 | 4116478752054 |