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 | 1 |
| 2 | 3 |
| 3 | 6 |
| 4 | 13 |
| 5 | 31 |
| 6 | 76 |
| 7 | 192 |
| 8 | 504 |
| 9 | 1351 |
| 10 | 3668 |
| 11 | 10082 |
| 12 | 27991 |
| 13 | 78335 |
| 14 | 220778 |
| 15 | 626141 |
| 16 | 1785593 |
| 17 | 5117179 |
| 18 | 14729826 |
| 19 | 42568767 |
| 20 | 123465517 |
| 21 | 359268141 |
| 22 | 1048541699 |
| 23 | 3068583485 |
| 24 | 9002849260 |
| 25 | 26474484680 |
| 26 | 78019959584 |
| 27 | 230381635121 |
| 28 | 681544367457 |
| 29 | 2019718168994 |
| 30 | 5995000501189 |