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) |
|---|---|
| 2 | 1 |
| 3 | 6 |
| 4 | 21 |
| 5 | 62 |
| 6 | 162 |
| 7 | 396 |
| 8 | 917 |
| 9 | 2036 |
| 10 | 4380 |
| 11 | 9152 |
| 12 | 18694 |
| 13 | 37380 |
| 14 | 73444 |
| 15 | 141918 |
| 16 | 270370 |
| 17 | 508178 |
| 18 | 943876 |
| 19 | 1733468 |
| 20 | 3151396 |
| 21 | 5674152 |
| 22 | 10126435 |
| 23 | 17921016 |
| 24 | 31468623 |
| 25 | 54848750 |
| 26 | 94935565 |
| 27 | 163232096 |
| 28 | 278903915 |
| 29 | 473693432 |
| 30 | 799949111 |
| 31 | 1343550666 |
| 32 | 2244807927 |
| 33 | 3731885232 |