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 | 23 |
| 2 | 506 |
| 3 | 11132 |
| 4 | 244904 |
| 5 | 5387888 |
| 6 | 118533536 |
| 7 | 2607737539 |
| 8 | 57370220292 |
| 9 | 1262144724225 |
| 10 | 27767181244572 |
| 11 | 610877928236268 |
| 12 | 13439313120022944 |
| 13 | 295664860014655824 |
| 14 | 6504626290553815116 |
| 15 | 143101764537275790477 |