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 | 225 |
| 3 | 15606 |
| 4 | 554931 |
| 5 | 16689816 |
| 6 | 477537957 |
| 7 | 13457517066 |
| 8 | 377519524263 |
| 9 | 10576236506508 |
| 10 | 296179535707065 |
| 11 | 8293376986582302 |
| 12 | 232217254675249371 |
| 13 | 6502103768266128576 |
| 14 | 182059062180981345549 |
| 15 | 5097654923210293555314 |
| 16 | 142734346723080681522255 |