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 | 6 |
| 2 | 16 |
| 3 | 44 |
| 4 | 122 |
| 5 | 340 |
| 6 | 950 |
| 7 | 2658 |
| 8 | 7442 |
| 9 | 20844 |
| 10 | 58392 |
| 11 | 163594 |
| 12 | 458356 |
| 13 | 1284250 |
| 14 | 3598338 |
| 15 | 10082246 |
| 16 | 28249720 |
| 17 | 79153804 |
| 18 | 221783810 |
| 19 | 621424108 |
| 20 | 1741191198 |
| 21 | 4878708658 |
| 22 | 13669836930 |
| 23 | 38302030548 |
| 24 | 107319902744 |
| 25 | 300703682402 |