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 | 1 |
| 2 | 5 |
| 3 | 36 |
| 4 | 327 |
| 5 | 3392 |
| 6 | 38795 |
| 7 | 469662 |
| 8 | 5935728 |
| 9 | 77416352 |
| 10 | 1035050705 |
| 11 | 14094000938 |
| 12 | 195075365778 |
| 13 | 2734475097609 |
| 14 | 38747262233793 |
| 15 | 554199475506095 |
| 16 | 7990492729051526 |
| 17 | 115995691148658656 |
| 18 | 1694340616136589743 |
| 19 | 24882428969673439384 |
| 20 | 367160435328847044586 |