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 | 3 |
| 3 | 17 |
| 4 | 147 |
| 5 | 1729 |
| 6 | 25827 |
| 7 | 468593 |
| 8 | 10012083 |
| 9 | 246287521 |
| 10 | 6856204803 |
| 11 | 213102768977 |
| 12 | 7315460977107 |
| 13 | 274894137157249 |
| 14 | 11223280473993507 |
| 15 | 494715928976218673 |
| 16 | 23416019742035332083 |
| 17 | 1184519963466363339361 |
| 18 | 63774753426394808946243 |
| 19 | 3641219528568659379843857 |