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 | 5 |
| 2 | 22 |
| 3 | 98 |
| 4 | 436 |
| 5 | 1940 |
| 6 | 8632 |
| 7 | 38408 |
| 8 | 170896 |
| 9 | 760400 |
| 10 | 3383392 |
| 11 | 15054368 |
| 12 | 66984256 |
| 13 | 298045760 |
| 14 | 1326151552 |
| 15 | 5900697728 |
| 16 | 26255094016 |
| 17 | 116821771520 |
| 18 | 519797274112 |
| 19 | 2312832639488 |
| 20 | 10290925106176 |
| 21 | 45789365703680 |
| 22 | 203739313027072 |
| 23 | 906535983515648 |
| 24 | 4033622560116736 |