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 | 6 |
| 2 | 19 |
| 3 | 56 |
| 4 | 157 |
| 5 | 430 |
| 6 | 1171 |
| 7 | 3204 |
| 8 | 8857 |
| 9 | 24794 |
| 10 | 70303 |
| 11 | 201712 |
| 12 | 584677 |
| 13 | 1708998 |
| 14 | 5028715 |
| 15 | 14873180 |
| 16 | 44160817 |
| 17 | 131499442 |
| 18 | 392401207 |
| 19 | 1172747208 |
| 20 | 3508804477 |
| 21 | 10506490526 |
| 22 | 31477528579 |
| 23 | 94344505396 |
| 24 | 282848966857 |
| 25 | 848161024650 |
| 26 | 2543677767631 |
| 27 | 7629355581344 |