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 | 15 |
| 2 | 113 |
| 3 | 575 |
| 4 | 2171 |
| 5 | 6581 |
| 6 | 16955 |
| 7 | 38613 |
| 8 | 79885 |
| 9 | 153091 |
| 10 | 275661 |
| 11 | 471395 |
| 12 | 771863 |
| 13 | 1217945 |
| 14 | 1861511 |
| 15 | 2767241 |
| 16 | 4014585 |
| 17 | 5699863 |
| 18 | 7938505 |
| 19 | 10867431 |
| 20 | 14647571 |
| 21 | 19466525 |
| 22 | 25541363 |
| 23 | 33121565 |
| 24 | 42492101 |
| 25 | 53976651 |