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 | 14 |
| 2 | 109 |
| 3 | 623 |
| 4 | 2951 |
| 5 | 12331 |
| 6 | 47191 |
| 7 | 169416 |
| 8 | 579889 |
| 9 | 1914226 |
| 10 | 6144668 |
| 11 | 19298724 |
| 12 | 59579803 |
| 13 | 181448918 |
| 14 | 546629054 |
| 15 | 1632497850 |
| 16 | 4841448042 |
| 17 | 14277423006 |
| 18 | 41912838982 |
| 19 | 122587133760 |
| 20 | 357476552161 |
| 21 | 1039922075888 |
| 22 | 3019280091491 |
| 23 | 8752184436454 |
| 24 | 25337900299765 |