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 | 0 |
| 1 | 7 |
| 2 | 26 |
| 3 | 57 |
| 4 | 190 |
| 5 | 646 |
| 6 | 1914 |
| 7 | 5960 |
| 8 | 18824 |
| 9 | 58248 |
| 10 | 181196 |
| 11 | 565328 |
| 12 | 1759720 |
| 13 | 5477376 |
| 14 | 17062956 |
| 15 | 53131824 |
| 16 | 165443096 |
| 17 | 515219344 |
| 18 | 1604410136 |
| 19 | 4996129756 |
| 20 | 15558217340 |
| 21 | 48448930636 |
| 22 | 150871392396 |
| 23 | 469819443204 |
| 24 | 1463035474136 |
| 25 | 4555944690588 |
| 26 | 14187380873768 |