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 | 10 |
| 2 | 29 |
| 3 | 72 |
| 4 | 163 |
| 5 | 350 |
| 6 | 729 |
| 7 | 1492 |
| 8 | 3023 |
| 9 | 6090 |
| 10 | 12229 |
| 11 | 24512 |
| 12 | 49083 |
| 13 | 98230 |
| 14 | 196529 |
| 15 | 393132 |
| 16 | 786343 |
| 17 | 1572770 |
| 18 | 3145629 |
| 19 | 6291352 |
| 20 | 12582803 |
| 21 | 25165710 |
| 22 | 50331529 |
| 23 | 100663172 |
| 24 | 201326463 |
| 25 | 402653050 |
| 26 | 805306229 |
| 27 | 1610612592 |
| 28 | 3221225323 |