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 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 5 |
| 7 | 128 |
| 8 | 2124 |
| 9 | 29445 |
| 10 | 373379 |
| 11 | 4517921 |
| 12 | 53342405 |
| 13 | 622358262 |
| 14 | 7229196009 |
| 15 | 83984283157 |
| 16 | 978558652802 |
| 17 | 11455522117193 |
| 18 | 134879815196252 |
| 19 | 1598299236441571 |
| 20 | 19067702481168369 |