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 | 1 |
| 2 | 0 |
| 3 | 1 |
| 4 | 1 |
| 5 | 2 |
| 6 | 5 |
| 7 | 9 |
| 8 | 23 |
| 9 | 49 |
| 10 | 120 |
| 11 | 279 |
| 12 | 682 |
| 13 | 1654 |
| 14 | 4079 |
| 15 | 10129 |
| 16 | 25277 |
| 17 | 63639 |
| 18 | 160685 |
| 19 | 408373 |
| 20 | 1041197 |
| 21 | 2666364 |
| 22 | 6850405 |
| 23 | 17657214 |
| 24 | 45644461 |
| 25 | 118303445 |
| 26 | 307385607 |
| 27 | 800463683 |
| 28 | 2088900834 |
| 29 | 5461793800 |
| 30 | 14306839474 |
| 31 | 37539357792 |
| 32 | 98655089606 |