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 | 18 |
| 2 | 254 |
| 3 | 1571 |
| 4 | 6335 |
| 5 | 19615 |
| 6 | 50743 |
| 7 | 115234 |
| 8 | 237066 |
| 9 | 451320 |
| 10 | 807180 |
| 11 | 1371293 |
| 12 | 2231489 |
| 13 | 3500861 |
| 14 | 5322205 |
| 15 | 7872820 |
| 16 | 11369668 |
| 17 | 16074894 |
| 18 | 22301706 |
| 19 | 30420615 |
| 20 | 40866035 |
| 21 | 54143243 |
| 22 | 70835699 |
| 23 | 91612726 |