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 | 7 |
| 4 | 46 |
| 5 | 29 |
| 6 | 219 |
| 7 | 495 |
| 8 | 1502 |
| 9 | 368357 |
| 10 | 27603 |
| 11 | 120539 |
| 12 | 1797358 |
| 13 | 462906349 |
| 14 | 32361431 |
| 15 | 33008607 |
| 16 | 12857291758 |
| 17 | 5972138981 |
| 18 | 750631865 |
| 19 | 99509722923 |
| 20 | 13841055262 |
| 21 | 31762354574285 |
| 22 | 1019248986603 |
| 23 | 8645573738319287 |