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) |
|---|---|
| 1 | 3 |
| 2 | 3 |
| 3 | 9 |
| 4 | 28 |
| 5 | 94 |
| 6 | 328 |
| 7 | 1197 |
| 8 | 4486 |
| 9 | 17235 |
| 10 | 67429 |
| 11 | 267932 |
| 12 | 1078003 |
| 13 | 4383784 |
| 14 | 17987897 |
| 15 | 74385984 |
| 16 | 309694232 |
| 17 | 1297037177 |
| 18 | 5460726214 |
| 19 | 23098296648 |
| 20 | 98113995068 |
| 21 | 418335662448 |
| 22 | 1789814398035 |
| 23 | 7681522429474 |
| 24 | 33061825858259 |
| 25 | 142674028869587 |
| 26 | 617180102839217 |