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 | 1 |
| 2 | 1 |
| 3 | 13 |
| 4 | 25 |
| 5 | 37 |
| 6 | 61 |
| 7 | 97 |
| 8 | 561 |
| 9 | 1869 |
| 10 | 4437 |
| 11 | 9097 |
| 12 | 17097 |
| 13 | 54101 |
| 14 | 194189 |
| 15 | 583857 |
| 16 | 1490017 |
| 17 | 3371997 |
| 18 | 8916485 |
| 19 | 28974361 |
| 20 | 94338361 |
| 21 | 277239461 |
| 22 | 728378813 |
| 23 | 1938657473 |
| 24 | 5839518033 |
| 25 | 18961970605 |
| 26 | 59883346869 |
| 27 | 174804016553 |
| 28 | 493085118121 |
| 29 | 1460284207861 |
| 30 | 4646560028141 |