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 | 0 |
| 1 | 1 |
| 2 | 2 |
| 3 | 7 |
| 4 | 9 |
| 5 | 17 |
| 6 | 30 |
| 7 | 181 |
| 8 | 213 |
| 9 | 296 |
| 10 | 369 |
| 11 | 1802 |
| 12 | 2449 |
| 13 | 17790 |
| 14 | 46001 |
| 15 | 56448 |
| 16 | 57664 |
| 17 | 77009 |
| 18 | 95190 |
| 19 | 746935 |
| 20 | 2289093 |
| 21 | 3753007 |
| 22 | 6539606 |
| 23 | 128829523 |
| 24 | 158059067 |
| 25 | 298060788 |
| 26 | 432415361 |
| 27 | 1207300530 |
| 28 | 1953285227 |
| 29 | 43665199740 |
| 30 | 124195273633 |