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 | 24 |
| 3 | 162 |
| 4 | 780 |
| 5 | 2970 |
| 6 | 9492 |
| 7 | 26474 |
| 8 | 66222 |
| 9 | 151560 |
| 10 | 322190 |
| 11 | 643632 |
| 12 | 1219374 |
| 13 | 2206932 |
| 14 | 3838590 |
| 15 | 6447660 |
| 16 | 10501172 |
| 17 | 16639974 |
| 18 | 25727292 |
| 19 | 38906870 |
| 20 | 57671880 |
| 21 | 83945862 |
| 22 | 120177024 |
| 23 | 169447302 |
| 24 | 235597650 |
| 25 | 323371100 |
| 26 | 438575202 |
| 27 | 588265524 |
| 28 | 780951962 |
| 29 | 1026829680 |