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 | 3 |
| 3 | 6 |
| 4 | 12 |
| 5 | 26 |
| 6 | 59 |
| 7 | 138 |
| 8 | 332 |
| 9 | 814 |
| 10 | 2028 |
| 11 | 5118 |
| 12 | 13054 |
| 13 | 33598 |
| 14 | 87143 |
| 15 | 227542 |
| 16 | 597640 |
| 17 | 1577866 |
| 18 | 4185108 |
| 19 | 11146570 |
| 20 | 29798682 |
| 21 | 79932298 |
| 22 | 215072896 |
| 23 | 580327122 |
| 24 | 1569942098 |
| 25 | 4257254850 |
| 26 | 11569980794 |
| 27 | 31508150890 |
| 28 | 85968266198 |
| 29 | 234975421554 |