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 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 0 |
| 7 | 1 |
| 8 | 1 |
| 9 | 8 |
| 10 | 15 |
| 11 | 70 |
| 12 | 165 |
| 13 | 608 |
| 14 | 1601 |
| 15 | 5259 |
| 16 | 14564 |
| 17 | 45040 |
| 18 | 127521 |
| 19 | 381691 |
| 20 | 1090130 |
| 21 | 3202382 |
| 22 | 9171574 |
| 23 | 26642413 |
| 24 | 76312777 |
| 25 | 220134939 |
| 26 | 629965221 |
| 27 | 1808975528 |
| 28 | 5170502225 |
| 29 | 14801940226 |
| 30 | 42257089390 |