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 | 1 |
| 2 | 241 |
| 3 | 81751 |
| 4 | 2466535 |
| 5 | 34099017 |
| 6 | 356237575 |
| 7 | 3382161175 |
| 8 | 31040377215 |
| 9 | 281338882705 |
| 10 | 2538405887395 |
| 11 | 22865861038983 |
| 12 | 205856624277475 |
| 13 | 1852911128126185 |
| 14 | 16676836226840751 |
| 15 | 150093537945401959 |