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 | 2 |
| 4 | 3 |
| 5 | 6 |
| 6 | 15 |
| 7 | 22 |
| 8 | 41 |
| 9 | 72 |
| 10 | 129 |
| 11 | 213 |
| 12 | 395 |
| 13 | 660 |
| 14 | 1173 |
| 15 | 2031 |
| 16 | 3582 |
| 17 | 6188 |
| 18 | 10927 |
| 19 | 18977 |
| 20 | 33333 |
| 21 | 58153 |
| 22 | 101954 |
| 23 | 178044 |
| 24 | 312080 |
| 25 | 545475 |
| 26 | 955317 |
| 27 | 1670990 |
| 28 | 2925711 |
| 29 | 5118558 |
| 30 | 8960938 |
| 31 | 15680072 |
| 32 | 27447344 |
| 33 | 48033498 |
| 34 | 84076139 |
| 35 | 147142492 |
| 36 | 257546234 |
| 37 | 450748482 |
| 38 | 788937188 |