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 | 0 |
| 1 | 2 |
| 2 | 3 |
| 3 | 14 |
| 4 | 45 |
| 5 | 167 |
| 6 | 609 |
| 7 | 2270 |
| 8 | 8517 |
| 9 | 32207 |
| 10 | 122463 |
| 11 | 467843 |
| 12 | 1794195 |
| 13 | 6903353 |
| 14 | 26635773 |
| 15 | 103020254 |
| 16 | 399300165 |
| 17 | 1550554583 |
| 18 | 6031074183 |
| 19 | 23493410759 |
| 20 | 91638191235 |
| 21 | 357874310213 |
| 22 | 1399137067683 |
| 23 | 5475504511859 |
| 24 | 21447950506395 |
| 25 | 84083979575117 |