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 | 12 |
| 3 | 124 |
| 4 | 424 |
| 5 | 1566 |
| 6 | 3876 |
| 7 | 9368 |
| 8 | 18768 |
| 9 | 36250 |
| 10 | 63100 |
| 11 | 106452 |
| 12 | 168312 |
| 13 | 259574 |
| 14 | 383124 |
| 15 | 554416 |
| 16 | 777376 |
| 17 | 1072818 |
| 18 | 1445868 |
| 19 | 1923500 |
| 20 | 2512200 |
| 21 | 3245902 |
| 22 | 4132612 |
| 23 | 5214024 |
| 24 | 6499824 |
| 25 | 8040266 |
| 26 | 9846876 |
| 27 | 11979268 |
| 28 | 14450968 |
| 29 | 17331750 |
| 30 | 20637300 |