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 | 0 |
| 2 | 1 |
| 3 | 1 |
| 4 | 32 |
| 5 | 1 |
| 6 | 1 |
| 7 | 37712 |
| 8 | 381596 |
| 9 | 9835475 |
| 10 | 36880858 |
| 11 | 5221912091 |
| 12 | 149759057759 |
| 13 | 186024798 |
| 14 | 456607833524310 |
| 15 | 655374897748042 |
| 16 | 32188411533060 |
| 17 | 3002590335363139484 |
| 18 | 1 |
| 19 | 1 |
| 20 | 1489192548103758778136571 |
| 21 | 905624730150525686386253700 |
| 22 | 1 |
| 23 | 110832638787270947169636975150 |
| 24 | 331748330219014906068858 |
| 25 | 349669183443106226663011852002384 |