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 | 98 |
| 3 | 2058 |
| 4 | 28812 |
| 5 | 336140 |
| 6 | 3529470 |
| 7 | 34588806 |
| 8 | 322828856 |
| 9 | 2905459704 |
| 10 | 25422772410 |
| 11 | 217505941730 |
| 12 | 1827049910532 |
| 13 | 15114685623492 |
| 14 | 123436599258518 |
| 15 | 996987917088030 |
| 16 | 7975903336704240 |
| 17 | 63275499804520304 |
| 18 | 498294560960597394 |