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 | 143 |
| 3 | 27693 |
| 4 | 5372251 |
| 5 | 1042188953 |
| 6 | 202179284583 |
| 7 | 39221739020101 |
| 8 | 7608815190614963 |
| 9 | 1476070925240282673 |
| 10 | 286350150681424223551 |
| 11 | 55550453161271059086173 |
| 12 | 10776501563135904038493963 |
| 13 | 2090585752795204112408742601 |
| 14 | 405562859540706461903257570583 |