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 | 11 |
| 3 | 51 |
| 4 | 176 |
| 5 | 530 |
| 6 | 1490 |
| 7 | 4043 |
| 8 | 10773 |
| 9 | 28445 |
| 10 | 74770 |
| 11 | 196116 |
| 12 | 513876 |
| 13 | 1345861 |
| 14 | 3524111 |
| 15 | 9226935 |
| 16 | 24157220 |
| 17 | 63245318 |
| 18 | 165579398 |
| 19 | 433493615 |
| 20 | 1134902265 |
| 21 | 2971214081 |
| 22 | 7778740966 |
| 23 | 20365009896 |
| 24 | 53316289896 |
| 25 | 139583861065 |
| 26 | 365435294675 |
| 27 | 956722024443 |
| 28 | 2504730780248 |