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 | 1 |
| 2 | 5 |
| 3 | 35 |
| 4 | 490 |
| 5 | 11075 |
| 6 | 334678 |
| 7 | 10274578 |
| 8 | 293142769 |
| 9 | 7563157341 |
| 10 | 176207637611 |
| 11 | 3726299739235 |
| 12 | 71996867385677 |
| 13 | 1279018609068332 |
| 14 | 21010435342847404 |
| 15 | 320746985138432185 |
| 16 | 4570573075546774047 |