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 | 38 |
| 4 | 190 |
| 5 | 1021 |
| 6 | 5494 |
| 7 | 29042 |
| 8 | 154772 |
| 9 | 824695 |
| 10 | 4386942 |
| 11 | 23356322 |
| 12 | 124344111 |
| 13 | 661873859 |
| 14 | 3523418150 |
| 15 | 18756407661 |
| 16 | 99845472493 |
| 17 | 531509598443 |
| 18 | 2829393615575 |
| 19 | 15061734439895 |
| 20 | 80178331797652 |
| 21 | 426814323111204 |
| 22 | 2272065745374039 |
| 23 | 12094915689644237 |