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 | 41 |
| 2 | 1926 |
| 3 | 90481 |
| 4 | 4250681 |
| 5 | 199691526 |
| 6 | 9381251041 |
| 7 | 440719107401 |
| 8 | 20704416796806 |
| 9 | 972666870342481 |
| 10 | 45694638489299801 |
| 11 | 2146675342126748166 |
| 12 | 100848046441467864001 |
| 13 | 4737711507406862859881 |
| 14 | 222571592801681086550406 |
| 15 | 10456127150171604205009201 |