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 | 7 |
| 2 | 30 |
| 3 | 102 |
| 4 | 303 |
| 5 | 825 |
| 6 | 2116 |
| 7 | 5200 |
| 8 | 12381 |
| 9 | 28779 |
| 10 | 65658 |
| 11 | 147594 |
| 12 | 327835 |
| 13 | 721069 |
| 14 | 1573056 |
| 15 | 3408084 |
| 16 | 7340265 |
| 17 | 15728895 |
| 18 | 33554710 |
| 19 | 71303470 |
| 20 | 150995271 |
| 21 | 318767457 |
| 22 | 671089020 |
| 23 | 1409286552 |
| 24 | 2952790453 |
| 25 | 6174015955 |
| 26 | 12884902386 |