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) |
|---|---|
| 1 | 1 |
| 2 | 4 |
| 3 | 11 |
| 4 | 29 |
| 5 | 94 |
| 6 | 263 |
| 7 | 968 |
| 8 | 3416 |
| 9 | 11520 |
| 10 | 41912 |
| 11 | 136972 |
| 12 | 481388 |
| 13 | 1743784 |
| 14 | 6275886 |
| 15 | 23615432 |
| 16 | 93819128 |
| 17 | 368019576 |
| 18 | 1367900808 |
| 19 | 5403282616 |
| 20 | 19831367476 |
| 21 | 76031433360 |
| 22 | 300581321056 |
| 23 | 1143307393600 |
| 24 | 4542840116352 |
| 25 | 17001097572544 |
| 26 | 65314285778004 |
| 27 | 246695766031432 |