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 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 5 |
| 5 | 11 |
| 6 | 26 |
| 7 | 65 |
| 8 | 163 |
| 9 | 417 |
| 10 | 1086 |
| 11 | 2858 |
| 12 | 7599 |
| 13 | 20391 |
| 14 | 55127 |
| 15 | 150028 |
| 16 | 410719 |
| 17 | 1130245 |
| 18 | 3124770 |
| 19 | 8675210 |
| 20 | 24175809 |
| 21 | 67603633 |
| 22 | 189633981 |
| 23 | 533463183 |
| 24 | 1504644945 |
| 25 | 4254179693 |
| 26 | 12055097308 |
| 27 | 34231674486 |
| 28 | 97392368007 |
| 29 | 277590288931 |
| 30 | 792528581088 |