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 | 4 |
| 2 | 12 |
| 3 | 32 |
| 4 | 81 |
| 5 | 200 |
| 6 | 488 |
| 7 | 1184 |
| 8 | 2865 |
| 9 | 6924 |
| 10 | 16724 |
| 11 | 40384 |
| 12 | 97505 |
| 13 | 235408 |
| 14 | 568336 |
| 15 | 1372096 |
| 16 | 3312545 |
| 17 | 7997204 |
| 18 | 19306972 |
| 19 | 46611168 |
| 20 | 112529329 |
| 21 | 271669848 |
| 22 | 655869048 |
| 23 | 1583407968 |
| 24 | 3822685009 |
| 25 | 9228778012 |
| 26 | 22280241060 |
| 27 | 53789260160 |
| 28 | 129858761409 |
| 29 | 313506783008 |