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 | 56 |
| 2 | 3492 |
| 3 | 306070 |
| 4 | 30942600 |
| 5 | 3062815568 |
| 6 | 279368748599 |
| 7 | 23161560633508 |
| 8 | 1747727428639023 |
| 9 | 120668752462156921 |
| 10 | 7668150385606788285 |
| 11 | 451008119329650593967 |
| 12 | 24676136165708649853590 |
| 13 | 1261674436562343441025436 |