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 | 3 |
| 6 | 9 |
| 7 | 21 |
| 8 | 52 |
| 9 | 113 |
| 10 | 261 |
| 11 | 550 |
| 12 | 1226 |
| 13 | 2542 |
| 14 | 5546 |
| 15 | 11389 |
| 16 | 24494 |
| 17 | 49989 |
| 18 | 106413 |
| 19 | 216258 |
| 20 | 456826 |
| 21 | 925586 |
| 22 | 1943550 |
| 23 | 3929090 |
| 24 | 8210896 |
| 25 | 16571018 |
| 26 | 34494114 |
| 27 | 69523116 |
| 28 | 144246532 |
| 29 | 290424604 |
| 30 | 600907508 |
| 31 | 1208835421 |
| 32 | 2495229602 |
| 33 | 5016122029 |
| 34 | 10332784253 |
| 35 | 20759855626 |