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 | 11 |
| 2 | 65 |
| 3 | 323 |
| 4 | 1849 |
| 5 | 10781 |
| 6 | 64325 |
| 7 | 388749 |
| 8 | 2371457 |
| 9 | 14559461 |
| 10 | 89788425 |
| 11 | 555446661 |
| 12 | 3443457697 |
| 13 | 21379001421 |
| 14 | 132867762617 |
| 15 | 826329001973 |
| 16 | 5141530912065 |
| 17 | 32001680946301 |
| 18 | 199227543918473 |
| 19 | 1240485517109477 |