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 | 0 |
| 2 | 1 |
| 3 | 34 |
| 4 | 2446 |
| 5 | 315788 |
| 6 | 66140883 |
| 7 | 21216724582 |
| 8 | 10063816019004 |
| 9 | 6854671838281696 |
| 10 | 6482951652242448021 |
| 11 | 8197210060548767881834 |
| 12 | 13365577359964731097098090 |
| 13 | 27292891758122129732383863668 |
| 14 | 68341049055686519197950975142247 |
| 15 | 206830351842829303737616801603098478 |