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 | 1 |
| 1 | 2 |
| 2 | 5 |
| 3 | 11 |
| 4 | 28 |
| 5 | 69 |
| 6 | 179 |
| 7 | 463 |
| 8 | 1225 |
| 9 | 3246 |
| 10 | 8697 |
| 11 | 23366 |
| 12 | 63137 |
| 13 | 171051 |
| 14 | 465002 |
| 15 | 1266831 |
| 16 | 3459262 |
| 17 | 9462393 |
| 18 | 25926939 |
| 19 | 71139400 |
| 20 | 195451500 |
| 21 | 537608802 |
| 22 | 1480316960 |
| 23 | 4079977874 |
| 24 | 11254956840 |
| 25 | 31072771980 |
| 26 | 85850016944 |
| 27 | 237356027117 |
| 28 | 656657132953 |
| 29 | 1817758531055 |
| 30 | 5034725293449 |