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 | 3 |
| 3 | 1 |
| 4 | 93 |
| 5 | 145 |
| 6 | 213 |
| 7 | 289 |
| 8 | 365 |
| 9 | 260511 |
| 10 | 9645025 |
| 11 | 395623447 |
| 12 | 17017308303 |
| 13 | 800016993275 |
| 14 | 902324346127 |
| 15 | 2502504187659113 |
| 16 | 152669617912106167 |
| 17 | 10229758110750827711 |
| 18 | 726365554791051924279 |
| 19 | 53027901964339123037045 |
| 20 | 57389311757677767147397 |