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 | 1 |
| 2 | 3 |
| 3 | 10 |
| 4 | 34 |
| 5 | 117 |
| 6 | 407 |
| 7 | 1430 |
| 8 | 5070 |
| 9 | 18122 |
| 10 | 65246 |
| 11 | 236436 |
| 12 | 861764 |
| 13 | 3157325 |
| 14 | 11622015 |
| 15 | 42961470 |
| 16 | 159419670 |
| 17 | 593636670 |
| 18 | 2217608250 |
| 19 | 8308432140 |
| 20 | 31212003420 |
| 21 | 117544456770 |
| 22 | 443690433654 |
| 23 | 1678353186780 |
| 24 | 6361322162444 |
| 25 | 24155384502452 |
| 26 | 91882005146652 |