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 | 31 |
| 2 | 37 |
| 3 | 61 |
| 4 | 157 |
| 5 | 541 |
| 6 | 8221 |
| 7 | 32797 |
| 8 | 131101 |
| 9 | 8388637 |
| 10 | 134217757 |
| 11 | 8589934621 |
| 12 | 137438953501 |
| 13 | 8796093022237 |
| 14 | 9223372036854775837 |
| 15 | 590295810358705651741 |
| 16 | 9444732965739290427421 |
| 17 | 604462909807314587353117 |
| 18 | 618970019642690137449562141 |
| 19 | 166153499473114484112975882535043101 |
| 20 | 170141183460469231731687303715884105757 |
| 21 | 883423532389192164791648750371459257913741948437809479060803100646309917 |