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 | 14 |
| 3 | 57 |
| 4 | 228 |
| 5 | 911 |
| 6 | 3642 |
| 7 | 14565 |
| 8 | 58256 |
| 9 | 233019 |
| 10 | 932070 |
| 11 | 3728273 |
| 12 | 14913084 |
| 13 | 59652327 |
| 14 | 238609298 |
| 15 | 954437181 |
| 16 | 3817748712 |
| 17 | 15270994835 |
| 18 | 61083979326 |
| 19 | 244335917289 |
| 20 | 977343669140 |
| 21 | 3909374676543 |
| 22 | 15637498706154 |
| 23 | 62549994824597 |
| 24 | 250199979298368 |
| 25 | 1000799917193451 |