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 | 6 |
| 3 | 71 |
| 4 | 1261 |
| 5 | 29906 |
| 6 | 887751 |
| 7 | 31657851 |
| 8 | 1318279586 |
| 9 | 62783681421 |
| 10 | 3365947782611 |
| 11 | 200610405843926 |
| 12 | 13157941480889921 |
| 13 | 941848076798467801 |
| 14 | 73060842413607398806 |
| 15 | 6105266987293752470991 |
| 16 | 546770299628690541571901 |
| 17 | 52244284936267317229542466 |
| 18 | 5305131708827069245129523591 |