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 | 18 |
| 2 | 297 |
| 3 | 5349 |
| 4 | 109095 |
| 5 | 2529909 |
| 6 | 66345668 |
| 7 | 1951815218 |
| 8 | 63879120597 |
| 9 | 2307569048308 |
| 10 | 91351738972187 |
| 11 | 3937843359099176 |
| 12 | 183778364128820499 |
| 13 | 9238674078250458082 |
| 14 | 497996763423626058847 |
| 15 | 28666454637876852704364 |