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 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 2 |
| 5 | 9 |
| 6 | 44 |
| 7 | 233 |
| 8 | 1472 |
| 9 | 10610 |
| 10 | 82828 |
| 11 | 688511 |
| 12 | 6042580 |
| 13 | 55523953 |
| 14 | 530498426 |
| 15 | 5242548633 |
| 16 | 53361716373 |
| 17 | 557495995958 |
| 18 | 5961086843092 |
| 19 | 65077096683358 |
| 20 | 723862991146939 |
| 21 | 8189257485453446 |
| 22 | 94087399914391254 |
| 23 | 1096331953010025684 |
| 24 | 12941148147430923798 |