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) |
|---|---|
| 0 | 1 |
| 1 | 13 |
| 2 | 90 |
| 3 | 443 |
| 4 | 1741 |
| 5 | 5811 |
| 6 | 17109 |
| 7 | 45577 |
| 8 | 111852 |
| 9 | 256282 |
| 10 | 553866 |
| 11 | 1138111 |
| 12 | 2237936 |
| 13 | 4233203 |
| 14 | 7736276 |
| 15 | 13709265 |
| 16 | 23629373 |
| 17 | 39718107 |
| 18 | 65254122 |
| 19 | 104994229 |
| 20 | 165732709 |
| 21 | 257035638 |
| 22 | 392194554 |
| 23 | 589452604 |
| 24 | 873566421 |
| 25 | 1277778529 |
| 26 | 1846288195 |
| 27 | 2637323484 |
| 28 | 3726933976 |
| 29 | 5213642329 |
| 30 | 7224113781 |
| 31 | 9920025945 |
| 32 | 13506347040 |
| 33 | 18241259200 |
| 34 | 24447994900 |