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 | 10 |
| 2 | 15 |
| 3 | 30 |
| 4 | 165 |
| 5 | 430 |
| 6 | 1170 |
| 7 | 3180 |
| 8 | 7935 |
| 9 | 18610 |
| 10 | 40948 |
| 11 | 84570 |
| 12 | 164740 |
| 13 | 304690 |
| 14 | 538630 |
| 15 | 915574 |
| 16 | 1504135 |
| 17 | 2398460 |
| 18 | 3725495 |
| 19 | 5653790 |
| 20 | 8404075 |
| 21 | 12261860 |
| 22 | 17592335 |
| 23 | 24857870 |
| 24 | 34638440 |
| 25 | 47655326 |
| 26 | 64798470 |
| 27 | 87157890 |
| 28 | 116059590 |