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 | 6 |
| 3 | 57 |
| 4 | 622 |
| 5 | 7338 |
| 6 | 91144 |
| 7 | 1174281 |
| 8 | 15548694 |
| 9 | 210295326 |
| 10 | 2892818244 |
| 11 | 40347919626 |
| 12 | 569274150156 |
| 13 | 8110508473252 |
| 14 | 116518215264492 |
| 15 | 1686062250699433 |
| 16 | 24552388991392230 |
| 17 | 359526085719652662 |
| 18 | 5290709340633314596 |
| 19 | 78201907647506243758 |
| 20 | 1160507655117628665252 |
| 21 | 17283862221822154612428 |
| 22 | 258257655550682547281952 |