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 | 9 |
| 2 | 116 |
| 3 | 2580 |
| 4 | 19544 |
| 5 | 295020 |
| 6 | 804076 |
| 7 | 4022064 |
| 8 | 7839780 |
| 9 | 24670536 |
| 10 | 99133020 |
| 11 | 147912160 |
| 12 | 427612404 |
| 13 | 791672280 |
| 14 | 1053546956 |
| 15 | 1796518224 |
| 16 | 3694034916 |
| 17 | 7030054140 |
| 18 | 8586690620 |
| 19 | 15076346164 |
| 20 | 21349986840 |
| 21 | 25222305336 |
| 22 | 40514492720 |
| 23 | 54489965796 |
| 24 | 82830096360 |
| 25 | 138828513824 |
| 26 | 176919851700 |