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 | 17 |
| 3 | 98 |
| 4 | 490 |
| 5 | 2411 |
| 6 | 11940 |
| 7 | 56093 |
| 8 | 256274 |
| 9 | 1140980 |
| 10 | 4977222 |
| 11 | 21273772 |
| 12 | 89281011 |
| 13 | 368408970 |
| 14 | 1496993290 |
| 15 | 5996312751 |
| 16 | 23700208290 |
| 17 | 92510062036 |
| 18 | 356887002352 |
| 19 | 1361671469470 |
| 20 | 5141380256124 |
| 21 | 19221678032134 |
| 22 | 71190778935805 |
| 23 | 261320839754142 |
| 24 | 951091521384860 |