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) |
|---|---|
| 6 | 1 |
| 7 | 1 |
| 8 | 15 |
| 9 | 59 |
| 10 | 288 |
| 11 | 1269 |
| 12 | 5580 |
| 13 | 24092 |
| 14 | 102847 |
| 15 | 434794 |
| 16 | 1824249 |
| 17 | 7600076 |
| 18 | 31459191 |
| 19 | 129505739 |
| 20 | 530589496 |
| 21 | 2164696038 |
| 22 | 8798355232 |
| 23 | 35639564649 |
| 24 | 143919521948 |
| 25 | 579526079335 |
| 26 | 2327484839124 |
| 27 | 9324921648372 |
| 28 | 37275509745894 |
| 29 | 148692946409186 |
| 30 | 591979810055622 |