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 | 3 |
| 1 | 27 |
| 2 | 272 |
| 3 | 2718 |
| 4 | 27183 |
| 5 | 271828 |
| 6 | 2718282 |
| 7 | 27182818 |
| 8 | 271828183 |
| 9 | 2718281828 |
| 10 | 27182818285 |
| 11 | 271828182846 |
| 12 | 2718281828459 |
| 13 | 27182818284590 |
| 14 | 271828182845905 |
| 15 | 2718281828459045 |
| 16 | 27182818284590452 |
| 17 | 271828182845904524 |
| 18 | 2718281828459045235 |
| 19 | 27182818284590452354 |
| 20 | 271828182845904523536 |