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 | 3 |
| 3 | 8 |
| 4 | 26 |
| 5 | 92 |
| 6 | 372 |
| 7 | 1566 |
| 8 | 7086 |
| 9 | 33550 |
| 10 | 167504 |
| 11 | 873226 |
| 12 | 4764614 |
| 13 | 26947632 |
| 14 | 157926628 |
| 15 | 954523378 |
| 16 | 5945067490 |
| 17 | 38060781922 |
| 18 | 250345198424 |
| 19 | 1688978186742 |
| 20 | 11679437620552 |
| 21 | 82652840640478 |
| 22 | 598018846154666 |
| 23 | 4418072084681592 |
| 24 | 33298670603875846 |
| 25 | 255782905412464810 |