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 | 0 |
| 1 | 1 |
| 2 | 1 |
| 3 | 3 |
| 4 | 7 |
| 5 | 29 |
| 6 | 131 |
| 7 | 585 |
| 8 | 3083 |
| 9 | 17089 |
| 10 | 97987 |
| 11 | 607977 |
| 12 | 3926731 |
| 13 | 26344001 |
| 14 | 185908739 |
| 15 | 1358432937 |
| 16 | 10279616891 |
| 17 | 80819893393 |
| 18 | 655374770131 |
| 19 | 5482528852761 |
| 20 | 47329769940331 |
| 21 | 420061520283617 |
| 22 | 3832533793409027 |
| 23 | 35926633641149865 |
| 24 | 345280194806563931 |