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 | 1 |
| 1 | 23 |
| 2 | 67 |
| 3 | 155 |
| 4 | 415 |
| 5 | 1103 |
| 6 | 3019 |
| 7 | 8339 |
| 8 | 23287 |
| 9 | 65495 |
| 10 | 185347 |
| 11 | 527099 |
| 12 | 1505215 |
| 13 | 4313423 |
| 14 | 12397963 |
| 15 | 35728115 |
| 16 | 103195687 |
| 17 | 298668263 |
| 18 | 865957171 |
| 19 | 2514793739 |
| 20 | 7313712655 |
| 21 | 21298240895 |
| 22 | 62096722843 |
| 23 | 181245885539 |
| 24 | 529545304903 |