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 | 1 |
| 4 | 0 |
| 5 | 2 |
| 6 | 2 |
| 7 | 6 |
| 8 | 5 |
| 9 | 21 |
| 10 | 18 |
| 11 | 70 |
| 12 | 61 |
| 13 | 239 |
| 14 | 206 |
| 15 | 828 |
| 16 | 711 |
| 17 | 2903 |
| 18 | 2485 |
| 19 | 10314 |
| 20 | 8791 |
| 21 | 37031 |
| 22 | 31451 |
| 23 | 134147 |
| 24 | 113566 |
| 25 | 489672 |
| 26 | 413419 |
| 27 | 1799084 |
| 28 | 1515282 |
| 29 | 6647009 |
| 30 | 5586834 |
| 31 | 24677902 |
| 32 | 20703840 |
| 33 | 92009606 |
| 34 | 77067674 |
| 35 | 344336294 |
| 36 | 288001040 |
| 37 | 1292929699 |
| 38 | 1079999410 |
| 39 | 4869184237 |
| 40 | 4062534430 |