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 | 3 |
| 2 | 8 |
| 3 | 19 |
| 4 | 0 |
| 5 | 169 |
| 6 | 896 |
| 7 | 1496 |
| 8 | 3334 |
| 9 | 21789 |
| 10 | 79403 |
| 11 | 239439 |
| 12 | 651236 |
| 13 | 1670022 |
| 14 | 3015650 |
| 15 | 27292097 |
| 16 | 55608749 |
| 17 | 234846164 |
| 18 | 366081231 |
| 19 | 2594727780 |
| 20 | 6395506991 |