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 | 1 |
| 7 | 0 |
| 8 | 1 |
| 9 | 1 |
| 10 | 4 |
| 11 | 3 |
| 12 | 15 |
| 13 | 25 |
| 14 | 92 |
| 15 | 234 |
| 16 | 803 |
| 17 | 2469 |
| 18 | 8512 |
| 19 | 28290 |
| 20 | 98148 |
| 21 | 338673 |
| 22 | 1188338 |
| 23 | 4180854 |
| 24 | 14840031 |
| 25 | 52904562 |
| 26 | 189724510 |
| 27 | 683384218 |
| 28 | 2472961423 |
| 29 | 8984888982 |
| 30 | 32772085447 |
| 31 | 119963084542 |
| 32 | 440623586740 |
| 33 | 1623555117611 |