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 | 9 |
| 3 | 3748 |
| 4 | 163160 |
| 5 | 2549775 |
| 6 | 22768402 |
| 7 | 141820764 |
| 8 | 685234196 |
| 9 | 2738273230 |
| 10 | 9438613635 |
| 11 | 28894483904 |
| 12 | 80240970524 |
| 13 | 205377597269 |
| 14 | 490460693060 |
| 15 | 1103418293480 |
| 16 | 2356809738456 |
| 17 | 4809498575164 |
| 18 | 9426116131517 |
| 19 | 17820475867500 |