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 | 1 |
| 4 | 1 |
| 5 | 5 |
| 6 | 11 |
| 7 | 30 |
| 8 | 69 |
| 9 | 142 |
| 10 | 334 |
| 11 | 740 |
| 12 | 1526 |
| 13 | 3273 |
| 14 | 6840 |
| 15 | 14251 |
| 16 | 29029 |
| 17 | 59729 |
| 18 | 122009 |
| 19 | 248070 |
| 20 | 500649 |
| 21 | 1012570 |
| 22 | 2040238 |
| 23 | 4107008 |
| 24 | 8257466 |
| 25 | 16562283 |
| 26 | 33229788 |
| 27 | 66621205 |
| 28 | 133478437 |
| 29 | 267326999 |
| 30 | 535146239 |
| 31 | 1071183438 |
| 32 | 2143604313 |
| 33 | 4289194948 |
| 34 | 8581463248 |