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 | 342 |
| 4 | 8372 |
| 5 | 15006 |
| 6 | 32942 |
| 7 | 45156 |
| 8 | 170982 |
| 9 | 369056 |
| 10 | 3008490 |
| 11 | 3954132 |
| 12 | 644931420 |
| 13 | 2009953056 |
| 14 | 12824996256 |
| 15 | 688604539866900 |
| 16 | 11580326725041402 |
| 17 | 26067179544075560 |
| 18 | 94815133778597582 |
| 19 | 502907499251402082 |
| 20 | 3337168950979864272 |
| 21 | 7864766939956291580 |