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 | 0 |
| 2 | 1 |
| 3 | 291 |
| 4 | 16096 |
| 5 | 356232 |
| 6 | 4411517 |
| 7 | 36621423 |
| 8 | 227095448 |
| 9 | 1128128568 |
| 10 | 4708376529 |
| 11 | 17078744419 |
| 12 | 55199550120 |
| 13 | 161993768080 |
| 14 | 438011626365 |
| 15 | 1103841220991 |
| 16 | 2616890599056 |
| 17 | 5880356075792 |
| 18 | 12602902382337 |
| 19 | 25897027973187 |
| 20 | 51245013077968 |
| 21 | 98017089897528 |
| 22 | 181801058663389 |