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 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 1 |
| 5 | 1 |
| 6 | 3 |
| 7 | 7 |
| 8 | 17 |
| 9 | 40 |
| 10 | 102 |
| 11 | 249 |
| 12 | 631 |
| 13 | 1594 |
| 14 | 4074 |
| 15 | 10443 |
| 16 | 26981 |
| 17 | 69923 |
| 18 | 182158 |
| 19 | 476141 |
| 20 | 1249237 |
| 21 | 3287448 |
| 22 | 8677074 |
| 23 | 22962118 |
| 24 | 60915508 |
| 25 | 161962845 |
| 26 | 431536102 |
| 27 | 1152022025 |
| 28 | 3081015684 |
| 29 | 8253947104 |
| 30 | 22147214029 |
| 31 | 59514474967 |