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 | 10 |
| 3 | 55 |
| 4 | 385 |
| 5 | 2365 |
| 6 | 15367 |
| 7 | 96613 |
| 8 | 611644 |
| 9 | 3832477 |
| 10 | 23970089 |
| 11 | 149170604 |
| 12 | 925530638 |
| 13 | 5722654098 |
| 14 | 35282873191 |
| 15 | 216928671076 |
| 16 | 1330360845060 |
| 17 | 8139139896353 |
| 18 | 49683631194244 |
| 19 | 302640125458942 |
| 20 | 1839793530751731 |
| 21 | 11163107720200726 |
| 22 | 67610680329079976 |