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 | 4 |
| 3 | 12 |
| 4 | 36 |
| 5 | 110 |
| 6 | 332 |
| 7 | 983 |
| 8 | 2876 |
| 9 | 8380 |
| 10 | 24428 |
| 11 | 71357 |
| 12 | 208868 |
| 13 | 612178 |
| 14 | 1795228 |
| 15 | 5264684 |
| 16 | 15436060 |
| 17 | 45248195 |
| 18 | 132616392 |
| 19 | 388652536 |
| 20 | 1138993032 |
| 21 | 3338020181 |
| 22 | 9782903524 |
| 23 | 28671786116 |
| 24 | 84032220964 |
| 25 | 246284956558 |
| 26 | 721820483900 |
| 27 | 2115530739035 |
| 28 | 6200240318564 |