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 | 15 |
| 2 | 119 |
| 3 | 665 |
| 4 | 2939 |
| 5 | 10933 |
| 6 | 35580 |
| 7 | 103972 |
| 8 | 277950 |
| 9 | 689282 |
| 10 | 1602727 |
| 11 | 3523945 |
| 12 | 7376794 |
| 13 | 14784390 |
| 14 | 28500705 |
| 15 | 53054702 |
| 16 | 95687240 |
| 17 | 167682306 |
| 18 | 286218490 |
| 19 | 476893794 |
| 20 | 777106448 |
| 21 | 1240505775 |
| 22 | 1942759458 |
| 23 | 2988915740 |
| 24 | 4522669833 |
| 25 | 6737871614 |
| 26 | 9892634850 |
| 27 | 14326424875 |