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 | 1 |
| 1 | 108 |
| 2 | 3396 |
| 3 | 49852 |
| 4 | 447777 |
| 5 | 2862384 |
| 6 | 14265040 |
| 7 | 58788720 |
| 8 | 208577633 |
| 9 | 655618172 |
| 10 | 1864806372 |
| 11 | 4877412332 |
| 12 | 11877770177 |
| 13 | 27199536768 |
| 14 | 59037366080 |
| 15 | 122252641280 |
| 16 | 242826555969 |
| 17 | 464730264172 |
| 18 | 860261412132 |
| 19 | 1545252073596 |
| 20 | 2700999547873 |
| 21 | 4605325025136 |
| 22 | 7675844020560 |
| 23 | 12529356938800 |