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 | 6 |
| 2 | 78 |
| 3 | 1308 |
| 4 | 24942 |
| 5 | 513876 |
| 6 | 11148012 |
| 7 | 250917624 |
| 8 | 5805563310 |
| 9 | 137233668900 |
| 10 | 3299955883428 |
| 11 | 80468668049160 |
| 12 | 1985171406618156 |
| 13 | 49458290358431688 |
| 14 | 1242613072013591832 |
| 15 | 31448339835422435568 |