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 | 1 |
| 2 | 3 |
| 3 | 29 |
| 4 | 65 |
| 5 | 281 |
| 6 | 595 |
| 7 | 9949 |
| 8 | 20613 |
| 9 | 84883 |
| 10 | 173965 |
| 11 | 1421113 |
| 12 | 2894229 |
| 13 | 11762641 |
| 14 | 23859587 |
| 15 | 773201629 |
| 16 | 1564082093 |
| 17 | 6321150767 |
| 18 | 12761711209 |
| 19 | 102977321267 |
| 20 | 207595672639 |
| 21 | 836499257311 |
| 22 | 1684433835077 |
| 23 | 27122471168057 |
| 24 | 54567418372945 |
| 25 | 219485160092143 |
| 26 | 441266239318305 |
| 27 | 3547513302275441 |