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 | 90 |
| 2 | 4005 |
| 3 | 117480 |
| 4 | 2555190 |
| 5 | 43949268 |
| 6 | 622614630 |
| 7 | 7471375560 |
| 8 | 77515521435 |
| 9 | 706252528630 |
| 10 | 5720645481903 |
| 11 | 41604694413840 |
| 12 | 273897571557780 |
| 13 | 1643385429346680 |
| 14 | 9038619861406740 |
| 15 | 45795673964460816 |
| 16 | 214667221708410075 |
| 17 | 934433788613079150 |