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 | 2 |
| 2 | 7 |
| 3 | 22 |
| 4 | 79 |
| 5 | 286 |
| 6 | 1071 |
| 7 | 4070 |
| 8 | 15721 |
| 9 | 61506 |
| 10 | 243703 |
| 11 | 977366 |
| 12 | 3968169 |
| 13 | 16313842 |
| 14 | 67942539 |
| 15 | 286769518 |
| 16 | 1227194947 |
| 17 | 5326324598 |
| 18 | 23451408843 |
| 19 | 104753097326 |
| 20 | 474663076539 |
| 21 | 2181355670806 |
| 22 | 10163422480887 |
| 23 | 47988508807190 |