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 | 7 |
| 2 | 137 |
| 3 | 2341 |
| 4 | 38629 |
| 5 | 1257937 |
| 6 | 50881679 |
| 7 | 164078209 |
| 8 | 18480100619 |
| 9 | 1187779852639 |
| 10 | 4086043585673 |
| 11 | 46823724627623 |
| 12 | 825926870076593 |
| 13 | 8826243587390221 |
| 14 | 6435629123661395137 |
| 15 | 721766119107018403553 |
| 16 | 5255377541226932317019 |
| 17 | 19239461977895120106181 |
| 18 | 2618947765106118753941303 |