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 | 3 |
| 1 | 13 |
| 2 | 35 |
| 3 | 105 |
| 4 | 231 |
| 5 | 581 |
| 6 | 1315 |
| 7 | 3225 |
| 8 | 6711 |
| 9 | 15221 |
| 10 | 32755 |
| 11 | 74505 |
| 12 | 154407 |
| 13 | 339397 |
| 14 | 718115 |
| 15 | 1589145 |
| 16 | 3243831 |
| 17 | 6946421 |
| 18 | 14482675 |
| 19 | 31259145 |
| 20 | 63894567 |
| 21 | 135588037 |
| 22 | 281203235 |
| 23 | 601400985 |
| 24 | 1219907127 |
| 25 | 2557715317 |
| 26 | 5267017715 |
| 27 | 11123540745 |
| 28 | 22600784679 |
| 29 | 47205887429 |